SDR ASAA2019071930112

Service difficulty report · Terminal · Boeing 737890

Difficulty date: July 19, 2019
Submitted: July 30, 2019
Operation: Air carrier
Aircraft: N587AS
Make and model: Boeing 737890
Aircraft serial: 35684
Aircraft time: 45,201 hours, 13,157 cycles
System (JASC): 2612 · Fire Detection
Part: Terminal
Condition: Broken
Location: Fire Warning
Stage of operation: TX
How discovered: C
Nature of condition: L
Precautionary procedure: K

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

What was found

#1 FIRE SWITCH DOES NOT TEST. GROUNDED - YES. VERIFIED DISCREPANCY. RESISTANCE AT D1002 PIN 24 TO 25 READING 3.7K OHMS SHOULD READ <3 OHMS. AT PINS 25 TO 2 READING 2.35K OHMS. SHOULD READ 862 OHMS. INSPECTED AND FOUND BROKEN TERMINAL AT M1758. AFTER NEW TERMINAL INSTALL READINGS WERE PINS 24 TO 25 1.9 OHMS. PINS 25 TO 2 READINGS WAS 859 OHMS. PERFORMED FIRE DETECTION OPS TEST REF AMM 26-11-00/501. SYS CHKS NML.