Service difficulty report · Downlock Switch · Piper PA44180

Difficulty date
May 11, 2015
Submitted
May 12, 2015
Operation
General aviation
Aircraft
N292PA
Make and model
Piper PA44180
Aircraft serial
4496116
Aircraft time
8,900 hours
Engine
Lyc O360E1A6D
Propeller
Hartzl HCC2YR2
Part
Downlock Switch
Part number
89291003
Condition
Separated
Location
Mlg
Part time
363 hours, 1,024 cycles
Stage of operation
AP
How discovered
O
Nature of condition
N
Precautionary procedure
L

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

What was found

ON APPROACH, AS THE GEAR WAS LOWERED THE PILOTS NOTED THERE WAS NO DOWN-AND-LOCKED INDICATION FOR THE RT MAIN GEAR. THE PILOTS ABORTED THE APPROACH AND RAN CHECKLISTS TO GET A POSITIVE GEAR INDICATION WITH NO SUCCESS. THEY WERE ABLE TO PERFORM AN UNEVENTFUL LANDING AFTER A TOWER FLYBY NOTED THE GEAR APPEARED TO BE DOWN. MAINTENANCE INSPECTED THE ACFT AND FOUND THE RT MLG DOWNLOCK SWITCH HAD BROKEN WIRES. THIS MAY BE DUE IN PART TO THE WIRING HARNESS THICK SHRINK WRAP, WHICH ENCOURAGES THE WIRES TO FLEX ONLY IN ONE AREA. THE SHRINK WRAP ALSO APPEARS TO HAVE BEEN APPLIED WITHOUT STRAIGHTENING THE WIRES, SO THE HARNESS IS CURLY AND SOME WIRES ARE MUCH TIGHTER THAN OTHERS. THIS SWITCH SURVIVED 7 MONTHS AND 1024 LANDINGS.

More about the Piper PA-44-180