<< >> NASA ASRS Report 814028, December 2008

Mechanic reports an MD90 was released without locking out the #2 engine thrust reverser; after flight crew noted the #2 engine performance penalty message illuminated on the overhead annunciator panel.

Attributes
ACN	814028
Time
Date	200812
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : powerplant technician : airframe
Experience	maintenance technician : 20
ASRS Report	814028
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other other : 1
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : manuals performance deficiency : fault isolation performance deficiency : logbook entry performance deficiency : testing performance deficiency : repair
Supplementary
Problem Areas	Maintenance Human Performance Aircraft Chart Or Publication
Primary Problem	Chart Or Publication

Narrative:

On the evening of dec/08; air carrier aircraft X; which is an MD90; the flight crew called line maintenance with a #2 engine performance penalty message illuminated on the overhead annunciator panel. I and another technician went to the gate to address the problem. I interrogated the right eec while the other technician called air carrier maintenance control to get the correct MEL number and fill out the logbook. The eec faulted the 'reverser SL sensor channel a or channel B hc eec.' we then ran a return to service test and the message went away and the airplane departed. We should have locked out the right engine thrust reverser because it had the same problem earlier that day on a different flight. I was unaware that this particular message would warrant locking out the reverser. I also could not find any reference in any manual requiring me to do so.

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Original NASA ASRS Text

Title: MECHANIC REPORTS AN MD90 WAS RELEASED WITHOUT LOCKING OUT THE #2 ENGINE THRUST REVERSER; AFTER FLIGHT CREW NOTED THE #2 ENGINE PERFORMANCE PENALTY MESSAGE ILLUMINATED ON THE OVERHEAD ANNUNCIATOR PANEL.

Narrative: ON THE EVENING OF DEC/08; ACR ACFT X; WHICH IS AN MD90; THE FLT CREW CALLED LINE MAINT WITH A #2 ENG PERFORMANCE PENALTY MESSAGE ILLUMINATED ON THE OVERHEAD ANNUNCIATOR PANEL. I AND ANOTHER TECHNICIAN WENT TO THE GATE TO ADDRESS THE PROB. I INTERROGATED THE R EEC WHILE THE OTHER TECHNICIAN CALLED ACR MAINT CTL TO GET THE CORRECT MEL NUMBER AND FILL OUT THE LOGBOOK. THE EEC FAULTED THE 'REVERSER SL SENSOR CHANNEL A OR CHANNEL B HC EEC.' WE THEN RAN A RETURN TO SVC TEST AND THE MESSAGE WENT AWAY AND THE AIRPLANE DEPARTED. WE SHOULD HAVE LOCKED OUT THE R ENG THRUST REVERSER BECAUSE IT HAD THE SAME PROB EARLIER THAT DAY ON A DIFFERENT FLT. I WAS UNAWARE THAT THIS PARTICULAR MESSAGE WOULD WARRANT LOCKING OUT THE REVERSER. I ALSO COULD NOT FIND ANY REF IN ANY MANUAL REQUIRING ME TO DO SO.

Data retrieved from NASA's ASRS site as of May 2009 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.