Gear door malfunction

[Mark Ashiku]

Update on the landing Gear issue:

A thorough review of all components of the landing gear system has been completed. This inspection included the following:


• Examination of all landing gear Up and Down indicator switches.
• Examination of all landing gear circuits including power pack and gear/stall warning circuits.
• Thorough inspection of the landing gear mechanical systems.
o Up locks.
o Down locks.
o Push rods.
o Hydraulic cylinders.
o Hydraulic hoses and connections.
o Power Pack.
o Power Pack solenoid.
o Gear control handle and linkage.
o Hydraulic fluid.
• The plane was jacked and the gear was:
o Retracted using the emergency had pump.
o Extended using the emergency had pump.
o Gear doors opened and closed (without cycling the gear) using the hand pump as per the POH.
o Landing gear was cycled ten (10) times using a hydraulic slave pump.
o Landing gear retraction and extension was stopped at various points in the cycle and examination of all of the mechanical and electrical components was performed.

Results:
• Negative. No detectable anomaly of the gear system was found.

Conclusion:
• Cause unknown.

Possible Causes:
• Defective circuit breaker.
• It may be possible that the (green) gear down indicator light/gear horn test switch malfunctioned resulting in excess load on the gear indicator circuit tripping the breaker. Subjectively, the gear/stall warning horn sounds much loader than before.

Action taken:
• Replacement of the gear indicator circuit breaker.
• Lubrication of the landing gear system.
• All electrical connections tested and verified secure.

Any other ideas???

Thanks for your input. It made a big difference in the level of confidence I had approaching this issue.


Best to all,

Mark