<< >> NASA ASRS Report 382320, October 1997

A B767-300 was dispatched with an engine thrust reverser deferred but rendered inoperative improperly caused by incorrect MEL special procedures.

Attributes
ACN	382320
Time
Date	199710
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz
State Reference	US
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Dusk
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	382320
Person 2
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	382127
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other
Situations
Publication	Unspecified

Narrative:

Aircraft arrived at ZZZ on flight yy at gate X with a reverse isln vlv EICAS information message. Xyz and myself deferred the message per the MEL, at this point the reverser was usable. Upon taking the logbook up to the crew at about XA45, the captain refused it in this condition and wanted the reverser inoperative. At this point I told xyz that I would take care of inoping the valves in the sail fairing if he put the pins in the reverser sleeves. I ordered a pin for the stow valve, pulled the cannon plug on the reverser isln valve on wired the valve. At that point I received the pin for the stow valve and installed it and lock wired in position. While I was doing this, finished the paperwork up and re-released the aircraft with the reverser inoperative. Upon landing in abc, the right reverser deployed part way. During further investigation, abc found that the isln was lock wired in the wrong position. I, the reporter, was the person that lock wired that valve. Supplemental information from acn 382127: while deferring right reverse inoperative the MEL stated to move the isolation valve to the closed position. The valve is normally closed so when it was moved it was inadvertently moved to the on position.

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Original NASA ASRS Text

Title: A B767-300 WAS DISPATCHED WITH AN ENG THRUST REVERSER DEFERRED BUT RENDERED INOP IMPROPERLY CAUSED BY INCORRECT MEL SPECIAL PROCS.

Narrative: ACFT ARRIVED AT ZZZ ON FLT YY AT GATE X WITH A REVERSE ISLN VLV EICAS INFO MESSAGE. XYZ AND MYSELF DEFERRED THE MESSAGE PER THE MEL, AT THIS POINT THE REVERSER WAS USABLE. UPON TAKING THE LOGBOOK UP TO THE CREW AT ABOUT XA45, THE CAPT REFUSED IT IN THIS CONDITION AND WANTED THE REVERSER INOP. AT THIS POINT I TOLD XYZ THAT I WOULD TAKE CARE OF INOPING THE VALVES IN THE SAIL FAIRING IF HE PUT THE PINS IN THE REVERSER SLEEVES. I ORDERED A PIN FOR THE STOW VALVE, PULLED THE CANNON PLUG ON THE REVERSER ISLN VALVE ON WIRED THE VALVE. AT THAT POINT I RECEIVED THE PIN FOR THE STOW VALVE AND INSTALLED IT AND LOCK WIRED IN POS. WHILE I WAS DOING THIS, FINISHED THE PAPERWORK UP AND RE-RELEASED THE ACFT WITH THE REVERSER INOP. UPON LNDG IN ABC, THE R REVERSER DEPLOYED PART WAY. DURING FURTHER INVESTIGATION, ABC FOUND THAT THE ISLN WAS LOCK WIRED IN THE WRONG POS. I, THE RPTR, WAS THE PERSON THAT LOCK WIRED THAT VALVE. SUPPLEMENTAL INFO FROM ACN 382127: WHILE DEFERRING R REVERSE INOP THE MEL STATED TO MOVE THE ISOLATION VALVE TO THE CLOSED POS. THE VALVE IS NORMALLY CLOSED SO WHEN IT WAS MOVED IT WAS INADVERTENTLY MOVED TO THE ON POS.

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.