Service difficulty report · Wire · Lear 55LEAR

Difficulty date
January 29, 2004
Submitted
March 4, 2004
Operation
Air carrier
Aircraft
N127GT
Make and model
Lear 55LEAR
Aircraft serial
067
Engine
Garrtt TFE731*
Part
Wire
Part number
4512245
Condition
Mismarked
Location
Thrust Reverser
Component
Thrust Reverser
Component part number
4510000502
Stage of operation
IN
How discovered
V
Nature of condition
W
Precautionary procedure
K

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

What was found

WE HAVE HAD THREE INSTANCES OF MISS-LABELED WIRES ON NEW DEPLOY SIGNAL SWITCHES (NR 45-12245) FOR MFG THRUST REVERSERS. TWO ON 9/16/98 AND ONE 1/14/04 (THIS SWITCH PURCHASED 8/10/03). ALL HAVE BEEN PURCHASED FROM MFG. THIS PLUNGER TYPE SWITCH HAS TWO CIRCUITS WITH SIX WIRES LABELED 1C, 2NC, 3NO FOR CIRCUIT NR 1 AND 4C, 5NO, GNC FOR CIRCUIT NR 2. WE HAVE FOUND THE NO (NORMALLY OPEN) AND NC (NORMALLY CLOSED) WIRE LABELS REVERSED FOR ONE CIRCUIT. EXAMPLE 5 NO WAS LABELED 6NC AND 6 NC WAS LABELED 5 NO. THIS PROBLEM CN BE DETERMINED WITH AN OHMMETER PRIOR TO INSTALLATION AND THE WIRE MARKERS SWAPPED TO THE CORRECT WIRES.