Aviation College of Kenya

D-ABPQ ACCIDENT
UPDATE
While the investigation is already underway to determine the cause of the nose gear collapse on Lufthansa's Boeing 787-9 Dreamliner, D-ABPQ (see previous posts), it is possible (given previous cases) that the safety pin was incorrectly positioned during nose gear maintenance.
During the gate stop for disembarkation/boarding, the landing gear is held in position by hydraulic pressure. With the engines off, the pressure is provided by the two electric pumps of the central hydraulic system.
Any maintenance on the landing gear that requires relieving hydraulic pressure must be performed after positioning a safety pin, which prevents the gear from moving.
In 2022, incorrect positioning of the safety pin led to the nose gear collapse on British Airways' Boeing 787-8 Dreamliner G-ZBJB.

A cabin crew member grabbed a water bottle to douse a smoking laptop.
The fire got worse. Emergency landing. 200 passengers diverted.
All because nobody had a clear protocol.
Lithium battery fires don't behave like normal fires. Water accelerates thermal runaway. Generic extinguishers miss the mark. And hesitation costs minutes you don't have.
Here's the 4-step framework I share with every airline I work with:
1. IDENTIFY
Confirm it's a lithium battery. Look for smoke, swelling, or chemical smell. Don't wait for flames.
2. COOLING
Use a solution with an integrated extinguisher. Cool the device. Monitor for reignition.
3. CONTAIN
Place the device in a certified containment bag immediately. Never use a blanket or overhead bin.
4. COMMUNICATE
Alert the captain, log the incident, follow your carrier's reporting chain. Every second counts.
The mistake I see most often: crews skip step 2 and go straight to step 3.
Cooling first. Always.
Without it, you're managing a fire in open air with passengers 3 feet away.
How does your airline currently handle lithium battery fires in the cabin?A cabin crew member grabbed a water bottle to douse a smoking laptop.
The fire got worse. Emergency landing. 200 passengers diverted.
All because nobody had a clear protocol.
Lithium battery fires don't behave like normal fires. Water accelerates thermal runaway. Generic extinguishers miss the mark. And hesitation costs minutes you don't have.
Here's the 4-step framework I share with every airline I work with:
1. IDENTIFY
Confirm it's a lithium battery. Look for smoke, swelling, or chemical smell. Don't wait for flames.
2. COOLING
Use a solution with an integrated extinguisher. Cool the device. Monitor for reignition.
3. CONTAIN
Place the device in a certified containment bag immediately. Never use a blanket or overhead bin.
4. COMMUNICATE
Alert the captain, log the incident, follow your carrier's reporting chain. Every second counts.
The mistake I see most often: crews skip step 2 and go straight to step 3.
Cooling first. Always.
Without it, you're managing a fire in open air with passengers 3 feet away.

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SCHOOL OF MEDICAL AND HEALTH SCIENCES
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Long Term Courses
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Short Term Courses (Open Courses)
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Long Term Courses
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10. Microsoft office
11. Programming Languages
12. CISCO Networking Academy
13. Ethical hacking
14. Flatter developer
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16. Android developer
17. Nodes JS
18. Server administration
19. N+
20. A+
21. Python
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1. Aeronautical Engineering
2. Automotive engineering
3. Electrical & Electronic Engineering
4. Electrical Installation
5. Motor Vehicle Technology
6. Automotive Engineering
7. Mechanical Engineering
8. Computer Engineering
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10. Solar PV installation
11. Welding
12. Welding and fabrication
13. Refrigeration and air Conditioning
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Long Term Courses
1. Journalism (Broadcast, Digital, Print)
2. Journalism and Media Studies
3. Marketing advertising & PR
4. Public Relarions
5. Animation and Digital media
6. Film and TV production
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2. Scripting
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Long Term Courses
1. Food and Beverage Production & Services
2. Catering & Accommodation Management
3. Housekeeping & Accommodation Studies
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8. Hotel and Catering Supervision
9. Hospitality Management
10. Culinary Arts
Short Term Courses (Open Courses)
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2. Patisserie & Baking Skills
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1. Flight Dispatch Operation
2. Tourism Management
3. Tour Guiding Operations
4. Tour Guiding Management
5. Tour Operations
6. Cargo Handling
7. Airline Cabin Crew
8. Foundation in Travel & Tourism
9. Consultancy in Travel & Tourism
10. Airport Operations
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1. French
2. English
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4. Spanish
5. German
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Long Term Courses
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Long term courses
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19. Basic investigation skills
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Long Term Courses
1. Fashion design & cloth tech
2. Fashion and Design(Dress Making and Tailoring)
3. Garment making
4. Foot wear Production
5. Interior design
6. Leather goods production
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1. Screen & block printing
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Long Term Courses
1. Beauty Therapy
2. Hair Dressing
3. Cosmetology
Short Term Courses (Open Courses)
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1. Light Motorcycle (class A2)
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7. Heavy Truck With Trailer (Class CE)
8. Van PSV (Class D1)
9. Mini Bus (Class D2)
10. Large Bus (Class D3)
PLANT OPERATOR COURSES(4, 6 & 8 Machines)
1. Backhoe
2. Excavator
3. Bulldozer
4. Motor Grader
5. Forklift
6. Wheel Shovel
7. Dumper Trucker
______________________________________
CISCO ACADEMY COURSES
1. IT Essentials
2. Cisco Certified Network Associate (CCNA)
.....................................................................
HIV TESTING AND COUNSELING COURSE-HTS
(NASCOP/ Ministry of Health accredited HTC course)
Duration 3 weeks
.....................................................................
PARTIALLY SPONSORED COMPUTER COURSES
.....................................................................
INTERNATIONAL COMPUTER DRIVING LICENSE (ICDL) COURSE
Fee is kshs 20,000 each part(part 1,2, &3). Fee is Inclusive of admission and ICDL final exams.
____________________________________________________________________
COMPUTER PACKAGES
Certificate in Computer Application is awarded upon completion of the course
New classes commence every Monday.
Course Units
1. Concept of IT
2. Microsoft Windows
3. Word processing Using Ms Word
4. Spreadsheet using Ms Excel
5. Database Management Using Ms Access
6. Graphic Presentation using Microsoft Power point
7. Personal Information Management Using Ms Outlook
8. Desktop Publishing using Ms Publisher
9. Internet Communication/Browsing
10. Typing Using Mavis Beacon
11. Social Media and Networking
12. PC Troubleshooting
13. Computer Networking
14. Software Installation/Uninstallation
Duration: 1-3 months depending on the number of hours you attend class per day. Part-time; Evening and Saturday classes Available
.....................................................................
OTHER PARTIALLY SPONSORED COMPUTER COURSES
.....................................................................
MICROSOFT OFFICE COURSES
• Microsoft Excel
• Microsoft Access
• Microsoft Word
• Microsoft Outlook
COMPUTER-AIDED GRAPHIC DESIGN
• Corel Draw
• Adobe Illustrator
• Adobe Photoshop
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• Microsoft Publisher
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• Auto CAD
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• Piranessi
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FINANCIAL (ACCOUNTING) APPLICATIONS
• Sage 50 Accounts
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• Quick Books
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• Photography
• Camera Operation
• Video Editing
• Sound Production
WHY WE ARE THE BEST AVIATION COLLEGE IN KENYA
1. Three Free Fully Sponsored Courses for all new students (Virtual Campus).
2. A brand new shirt for our students.
3. Our college is approved by the Ministry of Education TVETA and accredited by local and international exam bodies such as KNEC, KASNEB, KISM, HRMPB, ICM, JP –UK examinations, etc
4. Competent and friendly Customer Care Service.
5. Highly qualified and Competent Lecturer for both theoretical and practical lessons
6. Aviation College of Kenya offers free Cisco IT Essential Instructor-led course to all our Diploma and Certificate students, certified by CISCO.
7. Free High-Speed Internet Connection (WIFI) within our College in all our branches. This enables our students to study, Bid and carry out online jobs during their free time.
8. Modern ICT Labs and Engineering workshops in all our branches.
9. Guaranteed Industrial Attachment and Internship through our Partnership with HR Placement Agencies.
10. Credit transfer and unit exceptions to our Diploma Students wishing to advance to degree programs in local Private and Public Universities that we have signed Partnership MOUs.
11. Support for needy students wishing to raise School Fees.
12. Modern Equipped Kitchen in all our branches and Internship placement for School of Hospitality students.
13. Modern Executive Salon, Fashion and Design studio and Beauty center in all our branches plus Internship placement for School of Beauty and Fashion Design students.
14. Full scholarships for Refugees in partnership with the Danish Refugee Council.
15. Subsidized college fees for Certificate and Diploma Courses.
16. Aviation College of Kenya has professional, highly qualified and competent lecturers.
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Quick Tips – General Section 1 Subject JK2 Physics Stresses Aircraft are Built For
Reference General Mechanic Handbook FAA-H-8083-30B Chapter 5, page 5-12.
ACS code AM.I.J.K2 Work, power, force, and motion.
Stress
Whenever a machine is in operation, be it a simple machine like a lever or a screw, or a more complex machine like an aircraft piston engine or a hydraulically operated landing gear, the parts and pieces of that machine will experience something called stress. Whenever an external force is applied to an object, like a weight pushing on the end of a lever, a reaction will occur inside the object which is known as stress. Stress is typically measured in pounds per square foot or pounds per square inch (psi).
External force acting on an object causes the stress to manifest itself in one of five forms, or combination of those five. The five forms are tension, compression, torsion, bending, and shear.
The aircraft material must possess the strength required by the dimensions, weight, and use. The five basic stresses that metals may be required to withstand are tension, compression, shear, bending, and torsion.
Aircraft structures are subjected to several different types of stress during flight, landing, taxiing, pressurization, and maintenance operations. The main stresses acting on an aircraft are:
________________________________________
Primary Types of Stress in Aircraft Structures
1. Tension Stress
Tension occurs when forces pull a material apart.
• The material stretches or elongates.
• Common in:
o Wing lower surfaces during flight
o Control cables
o Tie rods
Example:
When lift bends a wing upward, the lower wing skin is usually in tension.
________________________________________
2. Compression Stress
Compression occurs when forces push material together.
• The material shortens or crushes.
• Common in:
o Landing gear struts
o Wing upper surfaces during flight
o Fuselage frames
Example:
The upper wing skin experiences compression as the wing bends upward.
________________________________________
3. Shear Stress
Shear stress acts parallel to the surface and tends to cause one part of a material to slide past another.
• Common around:
o Rivets and bolts
o Wing spars
o Fuselage joints
Example:
A rivet holding two sheets together resists shear loads trying to slide the sheets apart.
________________________________________
4. Bending Stress
Bending is a combination of tension and compression caused by a load acting across a structure.
• One side is in tension
• Opposite side is in compression
Common in:
• Wings
• Propeller blades
• Rotor blades
• Fuselage sections
Example:
During flight, wings bend upward because lift exceeds weight distribution.
________________________________________
5. Torsional Stress (Torsion)
Torsion is twisting stress caused by torque.
• Occurs when one end twists relative to another.
• Common in:
o Engine crankshafts
o Propeller shafts
o Wings during asymmetric lift
o Helicopter tail booms
Example:
Aileron movement can create twisting forces in a wing.
________________________________________
Additional Aircraft Structural Stresses
6. Bearing Stress
Occurs where two components contact each other.
• Common around:
o Bolt holes
o Riveted joints
o Pins and fittings
Example:
A bolt pressing against the edge of a hole creates bearing stress.
________________________________________
7. Fatigue Stress
Repeated cyclic loading weakens material over time.
• Caused by:
o Pressurization cycles
o Repeated takeoffs and landings
o Vibration
Can lead to:
• Cracks
• Structural failure if undetected
This is one of the most critical concerns in aircraft maintenance.
________________________________________
8. Thermal Stress
Produced by temperature changes causing expansion or contraction.
• Common in:
o High-speed aircraft
o Engine components
o Exhaust systems
Example:
Jet engine turbine blades experience severe thermal stress.
Important Aviation Maintenance Point
Aircraft structures are rarely subjected to only one stress at a time. Most components experience combined stresses during operation.
Example:
A wing spar may simultaneously experience:
• Bending
• Shear
• Tension
• Compression
• Torsion
Understanding these stresses is essential for:
• Aircraft design
• Structural inspection
• Damage assessment
• Maintenance and repair procedures
• Airworthiness evaluation

A modern geared turbofan jet engine and how air and energy flow through it. Air first enters the large fan at the front, where most of it bypasses the engine core to produce efficient thrust, while the remaining air goes into the core. This core air is compressed in stages by the low-pressure compressor (LPC) and then the high-pressure compressor (HPC), increasing its pressure and temperature. The compressed air then passes through the diffuser and combustor, where fuel is injected and burned, producing high-energy hot gases. These gases expand through the high-pressure turbine (HPT), which drives the HPC, and then through the low-pressure turbine (LPT), which powers the fan and LPC. In this engine, a fan drive gear system (FDGS) sits between the fan and the low-pressure shaft, allowing the fan to rotate at a slower, more efficient speed than the turbines. Bearings and intermediate cases support and align the rotating shafts, while the fan and turbine cases provide structural strength and airflow containmen

PT6 Engine Fuel Control Unit (FCU) Idle Adjustment System — one of the most critical rigging and tuning areas affecting engine stability, starting characteristics, and propeller behavior.
This system controls how the engine behaves during:
✅ Engine start
✅ Ground idle
✅ Taxi operations
✅ Reverse selection
✅ Power transition
✅ Shutdown sequence
⸻
🔍 What the PT6 Fuel Control Unit Does
The Fuel Control Unit (FCU) meters fuel flow to the engine based on:
* Power lever position
* Compressor speed (Ng)
* Air pressure signals
* Condition lever position
* Engine operating demands
The FCU maintains proper fuel scheduling to ensure:
✅ Stable combustion
✅ Proper acceleration
✅ Temperature control
✅ Engine responsiveness
⸻
⚙️ Key Components Shown in the Diagram
🔹 Fuel Control Unit Reversing Lever
Interfaces with cockpit power control for beta and reverse operation.
Controls fuel scheduling during:
* Reverse thrust
* Ground fine
* Beta range
⸻
🔹 Condition Control Lever
Cockpit-controlled lever used for:
* Fuel cutoff
* Low idle
* High idle
* Engine operation selection
This directly affects idle RPM settings.
⸻
🔹 Starting Control Unit
Provides additional fuel scheduling logic during engine start to prevent:
⚠️ Hot starts
⚠️ Hung starts
⚠️ Flameouts
⸻
🔹 Idle Control Lever
Controls low and high idle governing positions.
Critical during:
* Taxi
* Air conditioning loads
* Generator loads
* Propeller response
⸻
🔹 Hi Idle Adjustment Screw
Adjusts high idle fuel setting.
Too high:
⚠️ Excessive RPM
⚠️ Increased brake wear during taxi
⚠️ Harsh propeller response
Too low:
⚠️ Weak generator output
⚠️ Poor system performance
⸻
🔹 Low Idle Adjustment Screw
Controls minimum stabilized idle RPM.
Improper setting may cause:
⚠️ Engine instability
⚠️ Compressor stall risk
⚠️ Flameout tendency
⚠️ Rough idle operation
⸻
🔄 PT6 Idle Adjustment Philosophy
The PT6 uses different idle ranges because engine demands vary between:
✈️ Flight operation
and
🛞 Ground operation
🟢 Low Idle
Used for:
* Reduced taxi speed
* Lower fuel consumption
* Reduced brake wear
🔵 High Idle
Used when:
* Electrical demand increases
* Air conditioning loads increase
* Anti-ice systems operate
* Fast propeller response required
⸻
🛠️ Critical Maintenance Procedures
✅ Idle RPM Verification
Performed after:
* FCU replacement
* Rigging adjustment
* Engine troubleshooting
⸻
✅ Linkage Rigging Inspection
Improper linkage geometry can affect:
* Fuel scheduling
* Reverse operation
* Beta transition
⸻
✅ Condition Lever Travel Check
Ensures proper:
* Fuel cutoff
* Idle selection
* Engine response
⸻
✅ Fuel Leak Inspection
Critical around:
* FCU fittings
* Delivery tubes
* Control diaphragms
⸻
✅ Engine Ground Run
Used to verify:
* Stable Ng
* ITT limits
* Torque response
* Propeller behavior
⸻
🚨 Common Failure Symptoms
⚠️ Hung Start
Insufficient fuel scheduling during start.
⚠️ Hot Start
Excessive fuel causing high ITT.
⚠️ Rough Idle
Improper idle adjustment or contamination.
⚠️ Poor Acceleration
Fuel control response issue.
⚠️ Reverse Range Problems
Incorrect reversing linkage adjustment.
⚠️ Propeller Instability
Idle/beta interaction malfunction.
⸻
✈️ Why PT6 Idle Rigging Is So Important
Tiny adjustment changes can completely affect:
* Engine responsiveness
* Propeller control
* Taxi handling
* Fuel efficiency
* Turbine temperature margins
That’s why PT6 idle adjustments require:
✅ Precise AMM compliance
✅ Accurate RPM measurement
✅ Careful linkage setup
✅ Experienced maintenance personnel
“On a PT6… one small idle adjustment screw can change the behavior of an entire turboprop engine.” ⚙️✈️

⚙️ “The PT6A Propeller Control System is more than just changing blade angle…
it is a dynamic balance between ENGINE POWER, OIL PRESSURE, GOVERNOR CONTROL, and AERODYNAMIC LOAD. ✈️
Inside the system, the Propeller Governor constantly senses RPM changes and adjusts oil flow to the propeller hub to maintain selected speed.
When RPM increases:
➡ Governor ports oil
➡ Blade angle increases (HIGH PITCH)
➡ Aerodynamic drag increases
➡ RPM decreases back to selected range
When RPM drops:
➡ Governor reduces oil pressure
➡ Blade angle decreases (LOW PITCH)
➡ RPM increases again
This entire cycle happens continuously in flight within fractions of a second.
And during abnormal conditions:
⚠️ Beta valve malfunction
⚠️ Oil contamination
⚠️ Low accumulator pressure
⚠️ Pitch change linkage wear
can rapidly affect propeller response and aircraft controllability.
That’s why PT6A maintenance is not only mechanical work —
it is precision control of aerodynamic efficiency, engine protection, and flight safety.”

An emergency evacuation was launched at Chandigarh Airport on Tuesday after a power bank caught fire on an IndiGo flight from Hyderabad to Chandigarh.
“On 5 May 2026, while IndiGo flight 6E 108 from Hyderabad to Chandigarh was stationary after landing, an incident involving a customer's personal electronic equipment catching fire was reported,” IndiGo Airlines confirmed in a statement.
“In the interest of safety, an immediate evacuation was carried out and all the relevant authorities were immediately informed. All customers have been safely moved to the terminal and are being attended to by the team to ensure their well-being. The aircraft will undergo necessary checks before resuming operations. At IndiGo, the safety of our customers and crew remains our top priority,” the airline added further.

Brisbane based Executive Helicopters have this absolutely stunning Airbus Helicopters H125 on display at RotorTech Vertical Flight Exposition here on the Gold Coast. This is another stunning example that came out the doors of Pacific Crown Helicopters. The dark gunmetal grey with black around the windows looks amazing. DART Aerospace

Variable Stator Vane (VSV) System: Optimizing Jet Engine Compressor Performance:
The Variable Stator Vane (VSV) system is a key innovation in modern jet engines, ensuring optimum compressor efficiency and maintaining stall margin during both steady-state and transient operation.
A. System Overview:
The VSV system uses two hydraulic actuators with dual Linear Variable Differential Transducers (LVDTs) for position feedback. Through bellcrank assemblies, adjustable linkages, and actuation rings, vane movement from the Inlet Guide Vanes (IGV) through stage 3 is precisely controlled.
B. Control Function:
The Electronic Control Unit (ECU) schedules vane angles based on core engine speed (N2), compressor inlet temperature (T25), and altitude. By modulating the torque motor in the Hydromechanical Unit (HMU), high-pressure fuel flow drives the actuators. Feedback from LVDTs ensures accurate closed-loop control.
The system also adapts under transient conditions — throttle changes, altitude variation, or anti-ice activation. Safety features include icing bias adjustments, overspeed protection, and stall-prevention logic for rapid throttle movements (BODIE conditions).
C. Actuators & Position Feedback:
(At the heart of the system are the VSV actuators and sensors)
C.1. Actuators: Installed on the high-pressure compressor stator case, they are single-ended hydraulic cylinders powered by high-pressure fuel from the HMU. They apply force in both directions, transmitting motion through bellcranks, rods, and actuation rings to adjust vane angles with precision. Dual-stage seals, bearings, and internal stops ensure durability and stability.
C.2. Sensors (LVDTs): Each actuator integrates dual independent LVDTs, which act as high-accuracy position sensors. These generate voltages proportional to actuator stroke/vane angle. The ECU uses this feedback to compare actual vs. scheduled position and continuously fine-tunes actuator commands — closing the control loop with high precision.
Summary:
The VSV system exemplifies the integration of hydraulics, electronics, and aerodynamics to:
✔️ Maximize compressor efficiency;
✔️ Maintain stall margin across the flight envelope;
✔️ Enhance safety during transient conditions;
Modern turbomachinery depends on such innovations to deliver performance, stability, and reliability.