SDR SCNA20250127029

Service difficulty report · Heat Exchanger · Boeing 7378Q8

Difficulty date: January 24, 2025
Submitted: January 27, 2025
Operation: Air carrier
Aircraft: N804SY
Make and model: Boeing 7378Q8
Aircraft serial: 30689
Aircraft time: 73,037 hours, 27,862 cycles
System (JASC): 2130 · Cabin Pressure Control System
Part: Heat Exchanger
Condition: Dirty
Location: Zone 100
Stage of operation: CR
How discovered: O
Nature of condition: G, J
Precautionary procedure: B, A

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

What was found

CABIN DEPRESSURIZATION. BOTH PACK LIGHTS CAME ON, QRH CLEARED LIGHTS THEN THEY CAME ON AGAIN AT 1000MSL. PERFORMED DCPC BITE, FIM 21-53 TASK 820, FIM 21-31 TASK 803 NO FAULTS FOUND. C/W AMM 21-51-03-160-811 & TASK CARDS 21000001 & 21000002 HEAT EXCHANGER CLEANING. OPS CHECKS NORMAL. AMM 21-00-00-00-040-804 MMEL 21-1 DDG RESTORATION C/W. THIS CLEARS MEL 21-1-1-F

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