Service difficulty report · Relay · Boeing 7378

Difficulty date
December 6, 2025
Submitted
December 9, 2025
Operation
Air carrier
Aircraft
N27287
Make and model
Boeing 7378
Aircraft serial
60709
Aircraft time
9,686 hours, 3,338 cycles
Part
Relay
Part number
TDH71205001
Condition
Faulty
Stage of operation
TO
How discovered
L
Nature of condition
J
Precautionary procedure
A, D

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

What was found

FEEL DIFF PRESS LIGHT CAME ON DURING HIGH SPEED REGIME TAKEOFF ROLL. REFERENCED QRC. PERFORMED FIM 27-31 TASK 803 UP TO PARA D STEP 1B. FOUND BOTH FEEL SYS PITOT PROBE FLEX LINES DROOPED BELOW THE PROBES. REMOVED BOTH PROBES, CORRECTLY POSITIONED FLEX LINES ABOVE BOTH PROBES, AND REINSTALLED BOTH PROBES(REF ELB PAGE NO. 7195068 FOR ADD EMP:U412364 WORK PERFORMED). NO MESSAGES PRESENT ON OMF. CONTINUE TS FROM FIM 27-31 TASK 803 PARA D STEP 2. ALSO, THE FEEL DIFF PRESS LIGHT IS STILL ILLUMINATED CONTINUED T/S REF FIM 27-31 TASK 803. FOUND FEEL PRESSURE SWITCH ANNUCIATOR RELAY R981 WAS SHORTING, REPLACED REF WDM 27-33-11-1. OPS CHECK GOOD.PARTS USED: 58-2709-3-0001,QTY :1 ADD EMP:U305227

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