An air carrier MD88 flight crew has the circuit breaker to the captain's digital flight guidance com...

Attributes
ACN	363923
Time
Date	199703
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : rsw
State Reference	FL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-88
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	ground : parked ground other : taxi landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 190 flight time total : 9000 flight time type : 600
ASRS Report	363923
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : overcame equipment problem other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Upon touchdown in rsw, heard circuit breaker pop and smelled electrical fume. Dissipated when turning off runway and taxied into gate. With cockpit floods on, found digital flight guidance computer #1 circuit breaker opened. Reset with same results. Called for contract maintenance. Posted fire guard when opening east&east compartment. Everything checked ok. Maintenance tried to reset circuit breaker with same results. Aircraft was dispatched with digital flight guidance computer #1 and flight director command system #1 inoperative. This was a repeat irregularity that caused the aircraft to be removed from service earlier that day. They replaced digital flight guidance computer #1. It should also be noted that no autoplt was in use through approach and landing and that digital flight guidance computer #2 was selected since it was the first officer's leg. I'm just happy it didn't happen during the WX penetration into florida and that it wasn't a fire or smoke event. Callback conversation with reporter revealed the following information: the captain of this MD88 said that the circuit to his digital flight guidance computer was not re- established during the rest of the day. He was very critical of his company's maintenance procedure. He alleged that the maintenance personnel simply replace components without diagnosing the problem and he said that that technique led to the problem in this case.

Original NASA ASRS Text

Title: AN ACR MD88 FLC HAS THE CIRCUIT BREAKER TO THE CAPT'S DIGITAL FLT GUIDANCE COMPUTER OPEN WITH A LOUD POP AND THEY SMELLED ELECTRICAL FUMES. THIS WAS A REPEAT EVENT AND THE SYS WAS DISABLED IN ACCORDANCE WITH THE MEL.

Narrative: UPON TOUCHDOWN IN RSW, HEARD CIRCUIT BREAKER POP AND SMELLED ELECTRICAL FUME. DISSIPATED WHEN TURNING OFF RWY AND TAXIED INTO GATE. WITH COCKPIT FLOODS ON, FOUND DIGITAL FLT GUIDANCE COMPUTER #1 CIRCUIT BREAKER OPENED. RESET WITH SAME RESULTS. CALLED FOR CONTRACT MAINT. POSTED FIRE GUARD WHEN OPENING E&E COMPARTMENT. EVERYTHING CHKED OK. MAINT TRIED TO RESET CIRCUIT BREAKER WITH SAME RESULTS. ACFT WAS DISPATCHED WITH DIGITAL FLT GUIDANCE COMPUTER #1 AND FLT DIRECTOR COMMAND SYS #1 INOP. THIS WAS A REPEAT IRREGULARITY THAT CAUSED THE ACFT TO BE REMOVED FROM SVC EARLIER THAT DAY. THEY REPLACED DIGITAL FLT GUIDANCE COMPUTER #1. IT SHOULD ALSO BE NOTED THAT NO AUTOPLT WAS IN USE THROUGH APCH AND LNDG AND THAT DIGITAL FLT GUIDANCE COMPUTER #2 WAS SELECTED SINCE IT WAS THE FO'S LEG. I'M JUST HAPPY IT DIDN'T HAPPEN DURING THE WX PENETRATION INTO FLORIDA AND THAT IT WASN'T A FIRE OR SMOKE EVENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE CAPT OF THIS MD88 SAID THAT THE CIRCUIT TO HIS DIGITAL FLT GUIDANCE COMPUTER WAS NOT RE- ESTABLISHED DURING THE REST OF THE DAY. HE WAS VERY CRITICAL OF HIS COMPANY'S MAINT PROC. HE ALLEGED THAT THE MAINT PERSONNEL SIMPLY REPLACE COMPONENTS WITHOUT DIAGNOSING THE PROB AND HE SAID THAT THAT TECHNIQUE LED TO THE PROB IN THIS CASE.

Data retrieved from NASA's ASRS site as of July 2007 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.

An air carrier MD88 flight crew has the circuit breaker to the captain's digital flight guidance computer open with a loud pop and they smelled electrical fumes. This was a repeat event and the system was disabled in accordance with the MEL.