SDR UIEA2017060600949

Service difficulty report · Battery · Boeing 7673S1

Difficulty date: June 5, 2017
Submitted: June 7, 2017
Operation: Air carrier
Aircraft: N640GT
Make and model: Boeing 7673S1
Aircraft serial: 25221
Aircraft time: 83,281 hours, 17,658 cycles
System (JASC): 4940 · APU Start/Ignition System
Part: Battery
Part number: 893003
Part serial: C7724
Condition: Malfunctioned
Location: Apu
Stage of operation: CR
How discovered: O
Nature of condition: J
Precautionary procedure: O

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

What was found

APU INFLIGHT START FAILED. BITE CHECKED ECU, FOUND FAULTED START CIRCUIT . REMOVED AND REPLACED APU BATTERY IAW AMM 24-31-04 AND APU BATTERY CHECKED OK. MONITOR APU BATTERY VOLTAGE ON APU START, OPS OK. IAW FIM 49-11 TREE 958 - REPLACED THE BATTERY CHARGER IAW AMM 24-31-05, OPS CHECKED OK. APU OPS CHECKED IAW AMM 49-11-00/501, OK.

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