An MD82 crew reports failure of the CSD generator drive to disconnect after maintenance defers the unit per the MEL as inoperative and disconnected.

Home

Browse by month

Random

Latest

About

Contact

Attributes
ACN	502551
Time
Date	200102
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mmv.airport
State Reference	PA
Altitude	msl bound lower : 28000 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	MD-82
Operating Under FAR Part	Part 121
Navigation In Use	other
Route In Use	enroute airway : j145.airway
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 150 flight time total : 12500 flight time type : 500
ASRS Report	502551
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 6000 flight time type : 500
ASRS Report	502558
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : voltmeter, cycles ind. other flight crewa other flight crewb
Resolutory Action	flight crew : overcame equipment problem
Supplementary
Problem Areas	Maintenance Human Performance Flight Crew Human Performance Chart Or Publication Aircraft
Primary Problem	Aircraft

Narrative:

We had returned to ZZZ because of a malfunctioning CSD that would not disconnect per QRH. Maintenance MEL'ed the CSD. The mechanic stated that the CSD was disconnected upon examination and could not be reconnected. He intimated that there might be some 'residual readings' but that the unit was separated from the engine. Again we departed for msy. In-flight, the temperature and voltage were still not in conformance with the QRH. Oil temperatures (rise and outlet) were extremely high and voltage varied as high as 75 volts. I called our dispatcher on the radio and asked for maintenance. I was asked to wait while the mechanic 'finished an MEL.' we shouldn't have had to wait. When I described the situation, the mechanic assured me that the line mechanic had indeed 'disconnected' the CSD and that we were experiencing erroneous readings. Shortly after this conversation, the temperature returned to normal, the voltage dropped off the scale, and we continued to msy uneventfully.

Original NASA ASRS Text

Title: AN MD82 CREW RPTS FAILURE OF THE CSD GENERATOR DRIVE TO DISCONNECT AFTER MAINT DEFERS THE UNIT PER THE MEL AS INOP AND DISCONNECTED.

Narrative: WE HAD RETURNED TO ZZZ BECAUSE OF A MALFUNCTIONING CSD THAT WOULD NOT DISCONNECT PER QRH. MAINT MEL'ED THE CSD. THE MECH STATED THAT THE CSD WAS DISCONNECTED UPON EXAMINATION AND COULD NOT BE RECONNECTED. HE INTIMATED THAT THERE MIGHT BE SOME 'RESIDUAL READINGS' BUT THAT THE UNIT WAS SEPARATED FROM THE ENG. AGAIN WE DEPARTED FOR MSY. INFLT, THE TEMP AND VOLTAGE WERE STILL NOT IN CONFORMANCE WITH THE QRH. OIL TEMPS (RISE AND OUTLET) WERE EXTREMELY HIGH AND VOLTAGE VARIED AS HIGH AS 75 VOLTS. I CALLED OUR DISPATCHER ON THE RADIO AND ASKED FOR MAINT. I WAS ASKED TO WAIT WHILE THE MECH 'FINISHED AN MEL.' WE SHOULDN'T HAVE HAD TO WAIT. WHEN I DESCRIBED THE SIT, THE MECH ASSURED ME THAT THE LINE MECH HAD INDEED 'DISCONNECTED' THE CSD AND THAT WE WERE EXPERIENCING ERRONEOUS READINGS. SHORTLY AFTER THIS CONVERSATION, THE TEMP RETURNED TO NORMAL, THE VOLTAGE DROPPED OFF THE SCALE, AND WE CONTINUED TO MSY UNEVENTFULLY.

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.