<< >> NASA ASRS Report 1625541, March 2019

B757 flight crew reported several aircraft system malfunctions associated with an electrical bus failure and the loss of cargo smoke detection.

Attributes
ACN	1625541
Time
Date	201903
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Component
Aircraft Component	Electrical Distribution Busbar
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 137 Flight Crew Total 15100 Flight Crew Type 9267
Person 2
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 121 Flight Crew Type 155
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

Narrative:

On rotation from runway xxc at ZZZ; we experienced a right AC bus EICAS; left engine eec EICAS; right engine eec EICAS; cargo det air status message; and aft eqt exh fan 1 status message. We accomplished the right AC bus checklist and restored power to the right AC bus; by resetting the right engine generator control and the right AC bus tie. Next; we accomplished the left/right engine eec QRH.the captain had a conference call with maintenance and dispatch to deal with the two remaining status messages. Maintenance advised us that both cargo detector fans were inoperative in the cargo fire detection system; and possibly making the system inoperative. He was basing this on the MEL for cargo det air. As a result; with maintenance's knowledge; the captain elected to reset the circuit breaker S35 fire det cargo fan control using his emergency authority. The cycled circuit breaker cleared the cargo det air status message. We continued to our planned destination.

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Original NASA ASRS Text

Title: B757 flight crew reported several aircraft system malfunctions associated with an electrical bus failure and the loss of cargo smoke detection.

Narrative: On rotation from Runway XXC at ZZZ; we experienced a RIGHT AC BUS EICAS; LEFT ENG EEC EICAS; RIGHT ENG EEC EICAS; CARGO DET AIR status message; and AFT EQT EXH FAN 1 status message. We accomplished the Right AC Bus checklist and restored power to the right AC bus; by resetting the right engine generator control and the right AC bus tie. Next; we accomplished the L/R ENG EEC QRH.The Captain had a conference call with Maintenance and Dispatch to deal with the two remaining status messages. Maintenance advised us that both cargo detector fans were inoperative in the cargo fire detection system; and possibly making the system inoperative. He was basing this on the MEL for CARGO DET AIR. As a result; with Maintenance's knowledge; the Captain elected to reset the circuit breaker S35 Fire Det Cargo Fan Control using his emergency authority. The cycled circuit breaker cleared the CARGO DET AIR status message. We continued to our planned destination.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.