Service difficulty report · Uplock Switch · Cessna 560XL

Difficulty date
May 31, 2011
Submitted
June 2, 2011
Operation
Air carrier
Aircraft
N606QS
Make and model
Cessna 560XL
Aircraft serial
5605388
Aircraft time
6,873 hours, 5,525 cycles
Engine
Pwa PW545A
Part
Uplock Switch
Condition
Failed
Location
Rt Mlg
Stage of operation
CL
How discovered
O
Nature of condition
E, J
Precautionary procedure
A

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

What was found

NLG MAKES LOUD MECHANICAL BUMPING NOISES WHEN RAISED WHICH DOES NOT STOP. SOUNDED LIKE UPLOCK WOULDN'T HOLD & GEAR CONTINUOUSLY CYCLED UP. RED UNLOCK LIGHT DIMLY FLICKERED AS WELL. LOWERED HANDLE AND MLG PROPERLY LOCKED DOWN WITH 3 GREEN INDICATION. UNABLE TO DETERMINE IF HYD BYPASS VALVE CYCLING AS GEAR HANDLE WAS LOWERED AFTER LESS THAN 5 SECONDS OF MECHANICAL NOISE. CHECKED & FOUND RT MLG UPLOCK SWITCH OUT OF ADJUSTMENT CAUSING BOTH MAINS AND NOSE TO BUMP. ADJUSTED UPLOCK SWITCH. PERFORMED GEAR SWINGS WITH NO DEFECTS NOTED. OPS CHECKED GOOD IAW MM 32-30-05 AND 32-30-01.

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