Service difficulty report · Transducer · Boeing 757224

Difficulty date
June 27, 2025
Submitted
June 30, 2025
Operation
Air carrier
Aircraft
N67134
Make and model
Boeing 757224
Aircraft serial
29283
Aircraft time
95,611 hours, 20,710 cycles
Part
Transducer
Part number
H913A
Part serial
75244
Condition
Damaged
Location
Spoiler Sys
Part time
95,595 hours, 20,706 cycles
Stage of operation
DE
How discovered
O
Nature of condition
F, J
Precautionary procedure
O

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

What was found

SPOILERS CAUTION MSG DURING DESCENT POWER IDLE. SPOILERS DEPLOY ED WITH SLIGHT BANK RIGHTBITE OF SPOILER CONTROL MODULE 1, 2, AND 3 LEFT ALL SHOW SB LVDT FAULT, THAT ITS A HARD FAULT, AND ACTIVE. FLIGHT PHASE WAS ON GROUND. ALL 3 LEFT SCM'S FAULT D873, REF FIM 27-09 FAULT TREE 807 FOR FAULT D873 WHICH SUGGESTS REPLACING LVDT ATTACHED TO CONNECTOR FOR 3L SPOILER. ALL 3 SCM'S ON RIGHTSIDE SHOW NO FAULT. SMC 2 ALSO SHOWS SPOILER SHUTDOWN, CURRENTLY NOT ACTIVE, PHASE ON GROUND. REF FIM 27-09 FAULT TREE 807. SEE PHOTOS ATTACHED FOR SCRRENSHOT OF FIM, NOT TO BE USED AS OFFICIAL DOCUMENT BUT AS REFERENCE ONLY. LVDT MFG# H913A M&E# 19-2762-9-9001. AVAILABLE RON HOLD TT 1722754. BUNDLE ROUTING BEFORE REMOVAL PICTURES RANG OUT WIRES FROM D00639B PINS K4 AND K5 TO D00873 PINS 3 AND 5, WIRES CHECKED GOOD. RANG OUT SECONDARY COIL OF LVDT FOUND 435 OHMS, SAME AS NEW LVDT. CHECKED INDUCED VOLTAGE THROUGH FULL SPEEDBRAKE HANDLE RANGE OF MOTION, FOUND 1 VAC AT FULL DOWN AND ADD EMP:U371177 8.4 VAC AT FULL EXTEND POSITION. REF WDM 27-61-13, 27-61-17 AND 27-61-18, SSM 27-61-01. REMOVED AUTO-SPEEDBRAKE MECHANISM REF AMM 27-62-02-022-008, UP TO AND INCLUDING STEP 2.H.(5). NEXT STEP 2.K. REMOVAL OF SPEEDBRAKE LVDT. COMPLETED REMOVAL OF SPEEDBRAKE LVDT REF AMM 27-62-02-022-008. TERMINATED PINS ON NEW LVDT REF SWPM 20-61-11 AND BEGAN TRANSFERRING CONNECTORS FROM OLD LVDT TO NEW LVDT DUE TO PARTS NIS AT ORD COMPLETED TRANSFER OF CONNECTORS AND ROD ENDS TO NREF LP 5314556 FOR CORRECTIVE ACTION.