This document discusses inspection requirements for helicopters after incidents. It describes checking rotor blades and rotor heads if rotor overspeeding occurs below specified limits, and removing the main and tail rotor heads for overhaul if limits are exceeded. It also outlines inspecting gearboxes, engines, fuel tanks and filters for metal contamination or corrosion after gearbox/engine oil or fuel contamination incidents. The goal is to examine components for damage, remove contamination and corrosion, and replace parts if necessary to return the helicopter to an airworthy condition.

1. FOR TRAINING PURPOSE ONLY
Malaysian Institute of Aviation Technology
AJD21603 ROTORCRAFT SERVICING,
MAINTENANCE AND ROLE EQUIPMENT
WEEK 11:
INSPECTION REQUIREMENT FOR HELICOPTER AFTER
INCIDENT (CONTINUE)

2. FOR TRAINING PURPOSE ONLY
Malaysian Institute of Aviation Technology
LEARNING OBJECTIVE AND OUTCOME
OBJECTIVE:
1. GAIN KNOWLEDGE ON VARIOUS TYPES OF
HELICOPTER INCIDENTS AND ACTIONS TO BE
TAKEN AFTER SUCH INCIDENTS OCCURS.
OUTCOME:
1. EXPLAIN THE MAINTENANCE ACTIONS TO BE
TAKEN AFTER A HELICOPTER IS INVOLVED IN AN
INCIDENT.

3. FOR TRAINING PURPOSE ONLY
Malaysian Institute of Aviation Technology
INTRODUCTION
IN THIS LESSON WE WILL DISCUSS THE INSPECTIONS
TO BE CARRIED OUT AFTER A HELICOPTER IS
INVOLVED IN ANY OF THE FOLLOWING INCIDENTS;
1. Rotor over-speeds
2. Gearboxes and engine metal contamination
3. Fuel contamination

4. FOR TRAINING PURPOSE ONLY
Malaysian Institute of Aviation Technology
ROTOR OVERSPEEDING
The extent of the inspection will normally depend on
the degree of over speeding.
Over speeding below a specified limit will usually
entail checking the rotor blades for distortion and
damage and the rotor head for cracks and smooth
operation, but, if this limit is exceeded it is usually
specified that both the main rotor head and tail
rotor head should be removed for overhaul.

5. FOR TRAINING PURPOSE ONLY
Malaysian Institute of Aviation Technology
ROTOR OVERSPEEDING
If damage has occurred to the main rotor blades,
the rotor head, shaft, pitch control rods, tail rotor
and transmission should also be removed for
overhaul and the gearbox attachments should be
inspected for damage.
THE FOLLOWING FEW SLIDES ARE THE INSPECTION
REQUIREMENT ON AS355 FOLLOWING THE MAIN
ROTOR OVER SPEED.

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Malaysian Institute of Aviation Technology

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Malaysian Institute of Aviation Technology

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Malaysian Institute of Aviation Technology

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Malaysian Institute of Aviation Technology

10. FOR TRAINING PURPOSE ONLY
Malaysian Institute of Aviation Technology
MAIN GEARBOX & ENGINE OIL
CONTAMINATION
MAIN GEARBOX & ENGINE OIL CONTAMINATION IS
DEFINED AS THE PRESENCE OF METAL PARTICLES ON
THE MGB/ENGINE CHIP DETECTORS.

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Malaysian Institute of Aviation Technology

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Malaysian Institute of Aviation Technology

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Malaysian Institute of Aviation Technology

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Malaysian Institute of Aviation Technology

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Malaysian Institute of Aviation Technology

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Malaysian Institute of Aviation Technology

17. FOR TRAINING PURPOSE ONLY
Malaysian Institute of Aviation Technology
ENGINE OIL CONTAMINATION
Reference must be made to engine maintenance
manual to determine whether the amount of metal
particles found is within the limits or not.
Outside the limit means the engine has to be
returned to manufacturer for repair.
If the metal found is within the limit, then the filters,
strainers has to be removed & inspected. Ensure no
excessive metals are found.
Engine oil need to be replaced & fresh oil put in.
Do the ground run & monitor the light.
Do the monitoring within the specified period.

18. FOR TRAINING PURPOSE ONLY
Malaysian Institute of Aviation Technology
FUEL CONTAMINATION
The fuel tank must be completely drained & the
internal of the tank be thoroughly inspected for
corrosion caused by the presence of water in the
tank.
All the components inside the tank must be
inspected for corrosion.
All traces of corrosion must be removed.
Both airframe & engine fuel filters must be removed
& inspected.

19. FOR TRAINING PURPOSE ONLY
Malaysian Institute of Aviation Technology
FUEL CONTAMINATION
All associated pipelines inspected & flushed.
All affected engine fuel system components
especially the fuel control unit be inspected for
corrosion.
If in doubt the affected components must be
replaced.
The source of water entry into the fuel system must
be investigated & rectified.