SDR 2000UALA00285

Service difficulty report · Diode · Boeing 757222

Difficulty date: May 23, 2000
Submitted: October 4, 2000
Operation: Air carrier
Aircraft: N580UA
Make and model: Boeing 757222
Aircraft serial: 26698
Aircraft time: 24,566 hours, 8,383 cycles
Engine: Pwa PW2037
System (JASC): 2420 · AC Generation System
Part: Diode
Condition: Failed
Location: Idg
Stage of operation: CR
How discovered: O
Nature of condition: J
Precautionary procedure: A

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

What was found

RETURNED TO DEN AND LANDED UNDER AN AMBER ALERT DUE TO AN ELECTRICAL PROBLEM. *S/D* THE LEFT (NR 1) INTEGRATED DRIVE GENERATOR WAS REPLACED. THE IDG HAD AN INTERNAL DIODE FAILURE. C901 GEN CIRCUIT BREAKER WAS REPLACED. THE CIRCUIT BREAKER HAD BURNED AND PITTED MAIN CONTACTS. THE LEFT GENERATOR CONTROL UNIT WAS REPLACED. AN INTERNAL POTENTIOMETER R17 WAS OUT OF TOLERANCE. THE BUS POWER CONTROL UNIT WAS REPLACED. NO FURTHER DISCREPANCY HAS OCCURRED.