FAA questions mechanic's corrective action on pneumatic write up.

Attributes
ACN	309723
Time
Date	199506
Day	Tue
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz
State Reference	US
Altitude	agl bound lower : 0 agl bound upper : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	DC-10 30
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	ground : preflight ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	309723
Person 2
Affiliation	company : air carrier
Function	other personnel other oversight : supervisor
Qualification	other other : other
Events
Anomaly	other anomaly other
Independent Detector	other other : unspecified
Resolutory Action	none taken : detected after the fact
Consequence	faa : investigated
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

On jul/xb/95, it was reported to me by airlines safety department that a deferral I issued for aircraft X (DC10-30, on jun/xa/95 was being investigated by the FAA. 'Air extraction system pressure regulator valve inoperative per MEL 21- 32.' frankfurt maintenance advised maintenance control of a pneumatic leak between aft regulator valve and aft cargo vent jet pump -- a review of system operation and aircraft history was made -- showing no previous work was done in this area -- a decision was made to deactivate the regulator valve by closing the valves controling switch labeled 'lav/galley vent and cargo heat' thereby rendering the valve inoperative closed and preventing pneumatic system air leakage. (This is the only way to close the valve reference DC10 maintenance manual 21-20- 00 pg 15-18)

Original NASA ASRS Text

Title: FAA QUESTIONS MECH'S CORRECTIVE ACTION ON PNEUMATIC WRITE UP.

Narrative: ON JUL/XB/95, IT WAS RPTED TO ME BY AIRLINES SAFETY DEPT THAT A DEFERRAL I ISSUED FOR ACFT X (DC10-30, ON JUN/XA/95 WAS BEING INVESTIGATED BY THE FAA. 'AIR EXTRACTION SYS PRESSURE REGULATOR VALVE INOP PER MEL 21- 32.' FRANKFURT MAINT ADVISED MAINT CTL OF A PNEUMATIC LEAK BTWN AFT REGULATOR VALVE AND AFT CARGO VENT JET PUMP -- A REVIEW OF SYS OP AND ACFT HISTORY WAS MADE -- SHOWING NO PREVIOUS WORK WAS DONE IN THIS AREA -- A DECISION WAS MADE TO DEACTIVATE THE REGULATOR VALVE BY CLOSING THE VALVES CTLING SWITCH LABELED 'LAV/GALLEY VENT AND CARGO HEAT' THEREBY RENDERING THE VALVE INOP CLOSED AND PREVENTING PNEUMATIC SYS AIR LEAKAGE. (THIS IS THE ONLY WAY TO CLOSE THE VALVE REF DC10 MAINT MANUAL 21-20- 00 PG 15-18)

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.