Service difficulty report · Uplock Switch · Cessna 680A

Difficulty date
January 30, 2024
Submitted
January 31, 2024
Operation
Air carrier
Aircraft
N504QS
Make and model
Cessna 680A
Aircraft serial
680A0041
Aircraft time
7,009 hours, 4,690 cycles
Part
Uplock Switch
Part number
UNKNOWN
Condition
Out Of Adjust
Location
Mlg
Stage of operation
LD
How discovered
L
Nature of condition
J
Precautionary procedure
A

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

What was found

RIGHT MAIN GEAR DISAGREE ILLUMINATED DURING LANDING GEAR RETRACTION. DOWNLOADED ARIES TO TEXTRON FOR INTERROGATION OF CMC CHECKED LIVE VIEW FOR ANY WOW SWITCH ISSUES, NO ISSUES PRESENT. FOUND EMERGENCY GEAR EXTENSION BLOWDOWN BOTTLE IN DISCHARGE POSITION AND CONTROL ARM PULLED. ISSUE SEEMS TO BE WITH RETRACTION. ONCE AIRCRAFT IS ON JACKS WILL CONTINUE WITH MANUALLY RESETTING THE EMERGENCY CONTROL ARM ANO SERVICING PNEUMATIC BOTTLE BACK TO ORIGINAL CONFIGURATION. CONTINUE WITH LANDING GEAR SYSTEM AND LANDING GEAR CONTROL VALVE FUNCTIONAL CHECK. THE R GEAR DISAGREE WAS CAUSED BY THE R GEAR UPLOCK SWITCH NOT SHOWING UP ANO LOCKED AFTER THE GEAR WAS RETRACTED.VERIFY THE UPLOCK SWITCH RIGGING AND OPERATION. WHEN YOU RING OUT THE SWITCH MAKE SURE TO MANIPULATE THE WIRING HARNESS TO CHECK FOR BROKEN OR DAMAGED WIRES IN THE HARNESS. RUNG OUT WIRING AND MANIPULATED WIRES. ALL CHECKS GOOD, ANO RESISTANCE CHECK GOOD. REFERENCED CE·680A WIRING PRINT 32-30-01. CONNECTED GROUND HYDRAULIC CART. NEED TO CHECK ADJUSTMENT OF R MAIN UPLAOCK SWITCH. CONTACTED MCC AND ORDERED THE REQUIRED ORLNGS, P/N AS568·006 FOR THE SWITCH PLUNGER CHECKS. NEEDS GEAR BLEEDING FO ITEM 3.3 OF THIS WO, AND THEN TO CONTINUE WITH RIG CHECKS OF RH UPLOCK SWITCH. NOTE: FLIGHT HR METER CB IS PULLED FOR JACKING. MULTI METER JE1573 INSTALLED ORING ONTO SWITCH TO CHECK RIGGING. PERFORMED GEAR SWINGS, FOUND THE RIGGING TO BE OUT OF LIMITS. PERFORMED ADJUSTMENT OF UPLOCK SWITCH. INSECTEO SWITCH AND WIRING WITH NO DEFECTS, PERFORMED MULTPLE GEARS SWINGS WITH NO DEFECTS FOUND. OPS CHECK GOOD AT THIS TIME, IAW MM 32·32·00. ENGAGED BREAKERS AS NEEDED. ORIGINAL SUBMSSION DATE: 1/30/2024

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