SDR UIEA200300064

Service difficulty report · Csd · Boeing 747243B

Difficulty date: November 15, 2003
Submitted: January 13, 2004
Operation: Air carrier
Aircraft: N540MC
Make and model: Boeing 747243B
Aircraft serial: 22508
System (JASC): 2410 · Alternator-Generator Drive
Part: Csd
Condition: Malfunctioned
Location: Nr 1
Stage of operation: NR
How discovered: O
Nature of condition: H
Precautionary procedure: H

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

What was found

NR 1 GENERATOR FIELD TRIPPED CAUSING NR 2 GENERATOR TO TRIP ALSO. CHECKED EACH GENERATOR FREQUENCY AND VOLTS NR 2 OK. RETURNED TO NORMAL OPERATION WITH NR 3. NR 1 FREQUENCY WAS OVER 8000 THEN TRIPPED AGAIN. NR 1 CSD DISCONNECTED BY CHECKLIST PROCEDURES. REMOVED AND REPLACED NR 1 CSD IAW MM 24-11-01. OPERATION CHECK NORMAL NO LEAKS FOUND IAW MM 24-20-00. REMOVED AND REPLACED NR 1 GCU OPERATION CHECK NORMAL IAW MM 24-20-00. REMOVED AND REPLACED NR 2 GCU OPERATION CHECK NORMAL IAW MM 24-20-00. (M)