SDR ASAA1159733

Service difficulty report · Unknown · Boeing 737890

Difficulty date: June 1, 2011
Submitted: June 3, 2011
Operation: Air carrier
Aircraft: N594AS
Make and model: Boeing 737890
Aircraft serial: 35191
Aircraft time: 11,987 hours, 3,796 cycles
System (JASC): 2430 · DC Generating System
Part: Unknown
Condition: Malfunctioned
Location: Electrical Sys
Stage of operation: NR
How discovered: O
Nature of condition: J
Precautionary procedure: K

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

What was found

TR UNIT LIGHT "ON" ON ELECTRICAL PANEL. TR1 AND TR2 ZERO AMPS VOLTS 23. TR3 61 AMPS GOOD VOLTS. FOUND TR1 TR2 & TR3 BREAKERS OPEN AT P91 AND P92 PANELS. VISUALLY INSPECTED INSIDE AND BEHIND P91 & P92 PANELS. NO DEFECTS. PERFORMED TRU INSTALL TEST REF MM 24 32 11 400 801. PERFORMED OPS TEST OF DC SYSTEM REF MM 24 31 00 700 801 NO DEFECTS. RAN NR 1 AND NR 2 ENG. TRANSFERRED PWR BETWEEN ENG GENS APU AND EXT PWR W/NO DEFECTS. ETOPS GND VERIFICATION TESTS SUCCESSFUL.