Service difficulty report · Uplock · Cessna 550

Difficulty date
March 16, 2000
Submitted
April 12, 2000
Operation
General aviation
Make and model
Cessna 550
Aircraft serial
657
Part
Uplock
Part number
554110313
Condition
Damaged
Location
Lt Mlg
Stage of operation
NR
How discovered
O
Nature of condition
O
Precautionary procedure
O

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

What was found

CUSTOMER STATED HE REPLACED LT MLG UPLOCK HOOK DUE TO EXCESS PLAY AT ATTACH BOLT/SPACER AREA. MAINT FACILITY CONDUCTED PHASE-5 INSP AND ADD''L WORK. DURING L/G EXTEND/RETRACT TEST NOTED DURING EXT CYCLE, NOSE AND RT MLG EXTENDED NORMALLY, BUT LT FREE FELL. AFTER T/S, FOUND PRESS TO UPLOCK CYL, BUT NO PRESS AT OUTSIDE WHICH GOES TO DOWN SIDE OF MLG ACTUATOR. FOUND IF CLEVIS PIN WAS REMOVED FROM LINKAGE, THAT CONNECTS UPLOCK ACT TO HOOK, LT GEAR ACT EXTENDED NORMALLY. NOTIFIED CESSNA UPLOCK HOOK WAS CONTACTING RADIUS OF SUPPORT BRACKET. CESSNA BELIEVED CAUSE WAS A RADIUS CUT WAS ELIMINATED DURING MFG. SUPPORT HAD GOUGE WHERE HOOK CONTACTED IT AND CESSNA REQUESTED BOTH HOOK AND SUPPORT BE REPLACED. (X)

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