Service difficulty report · Uplock Switch · Cessna 560XL

Difficulty date
November 24, 2015
Submitted
December 1, 2015
Operation
Air carrier
Aircraft
N556QS
Make and model
Cessna 560XL
Aircraft serial
5605553
Aircraft time
7,379 hours, 5,739 cycles
Part
Uplock Switch
Condition
Out Of Adjust
Location
Mlg
Stage of operation
CL
How discovered
O
Nature of condition
N
Precautionary procedure
A

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

What was found

NOSE GEAR DID NOT COME UP. RED UNLOCK LIGHT ILLUMINATED. GEAR HANDLE WAS PLACED DOWN PRODUCING 3 GREEN LIGHTS. INSPECTED LG SYS FOR VISIBLE DEFECT, NONE NOTED. JACKED ACFT & PERFORMED SEVERAL GEAR SWINGS AT VARIOUS PRESS SETTINGS & SLOW RATES, NO DEFECTS NOTED. PERFORMED INSPECTION OF OF ALL THE UPLOCK SWITCHES VISUALLY & FUNCTIONALLY BY CONTINUITY CHECKS WITH NO FAULTS FOUND. PERFORMED UPLOCKS SWITCH ASSEMBLY ADJUSTMENTS & TESTS IAW MM 32-30-05. ADJUST ALL THREE UPLOCK SWITCHES TO SPECS. PERFORMED THE LG HYD SYS ADJUSTMENT & TESTS IAW MM 32-01-00 & TASK 32-01-00-720 LG FUNCTIONAL TEST PARA 3 A - F, 1 - 13, NO DEFECTS NOTED. INSPECTED GEAR MONITOR PCB NZ004 & GEAR CONTROL PCB NZ009 FOR VISUAL BURNS OR DEFECTS, NO DEFECTS NOTED. PERFORMED SEVERAL MORE SWINGS AFTER ASSEMBLY OF ALL DISTURBED ITEMS WITH ALL OPS CHECKED GOOD.

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