An MD80 had a life vest pouch installed under the observer's seat. Due to confusing engineering instructions; the pouch may have been installed incorrectly.

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Attributes
ACN	653560
Time
Date	200503
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 ground : parked
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	653560
Person 2
Affiliation	company : air carrier
Function	maintenance : inspector
ASRS Report	653559
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : company policies non adherence : far non adherence : published procedure
Independent Detector	other other : 2
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	contributing factor : engineering procedure performance deficiency : logbook entry performance deficiency : scheduled maintenance performance deficiency : installation
Supplementary
Problem Areas	Maintenance Human Performance Aircraft Chart Or Publication
Primary Problem	Chart Or Publication
Situations
Publication	Engineering Change Order

Narrative:

The first aircraft that I worked on had life vest pouch installed. The engineering change order (#X) that I was working with said that if no pouch currently installed under the observer's seat; to install the new pouch under the observer's seat. I was unable to find any reference to where to mount the pouch. So I drilled 4 3/16 inch holes in the seat pan; and installed the pouch under the pan. Notified my supervisor. Unable to find the correct mounting position.

Original NASA ASRS Text

Title: AN MD80 HAD A LIFE VEST POUCH INSTALLED UNDER THE OBSERVER'S SEAT. DUE TO CONFUSING ENGINEERING INSTRUCTIONS; THE POUCH MAY HAVE BEEN INSTALLED INCORRECTLY.

Narrative: THE FIRST ACFT THAT I WORKED ON HAD LIFE VEST POUCH INSTALLED. THE ENGINEERING CHANGE ORDER (#X) THAT I WAS WORKING WITH SAID THAT IF NO POUCH CURRENTLY INSTALLED UNDER THE OBSERVER'S SEAT; TO INSTALL THE NEW POUCH UNDER THE OBSERVER'S SEAT. I WAS UNABLE TO FIND ANY REF TO WHERE TO MOUNT THE POUCH. SO I DRILLED 4 3/16 INCH HOLES IN THE SEAT PAN; AND INSTALLED THE POUCH UNDER THE PAN. NOTIFIED MY SUPVR. UNABLE TO FIND THE CORRECT MOUNTING POS.

Data retrieved from NASA's ASRS site as of January 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.