Service difficulty report · Downlock Switch · Cessna 525B

Difficulty date
June 18, 2021
Submitted
July 6, 2021
Operation
General aviation
Aircraft
N241CJ
Make and model
Cessna 525B
Aircraft serial
0241
Aircraft time
3,824 hours, 3,415 cycles
Engine
Wilint FJ443A
Part
Downlock Switch
Condition
Failed
Location
Mlg
Stage of operation
CL
How discovered
O
Nature of condition
O
Precautionary procedure
A

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

AFTER LG RETRACTION THE RMLG DOWN LOCK GREEN LIGHT REMAINED ILLUMINATED. RECYCLED LG WITH NO CHANGE. THERE WERE NO OTHER INDICATION THAT THE RMLG HAD NOT RETRACTED I.E. NO YAW, AIR NOISE OR HYD PRESS ON LIGHT. THE LANDING GEAR WAS HYDRAULICALLY EXTENDED WITH EMERGENCY BLOW DN SYSTEM TO ENSURE IT WAS IN FACT DOWN AND LOCKED. THE LANDING WAS UNEVENTFUL. THE RMLG ACTUATOR WAS REPLACED WHICH HOUSES THE DOWN LOCK SWITCH AND IS NOT FIELD REPLACEABLE. OPS CHECK GOOD.

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