A B777 engineering change order for passenger oxygen generator lanyard connecting point attachment may be incorrect due to unclr engineering instructions.

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Attributes
ACN	628064
Time
Date	200408
Day	Tue
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B777-200
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	628064
Person 2
Affiliation	company : air carrier
Function	other personnel other
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper documentation non adherence : published procedure non adherence : far
Independent Detector	other other : 1
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	contributing factor : work cards contributing factor : engineering procedure performance deficiency : scheduled maintenance
Supplementary
Problem Areas	Aircraft Maintenance Human Performance Chart Or Publication
Primary Problem	Chart Or Publication

Narrative:

While performing lanyard change for eco X, left generator lanyard was inadvertently changed. Connecting point attachment confign may also be an issue, as per paperwork being unclr.

Original NASA ASRS Text

Title: A B777 ENGINEERING CHANGE ORDER FOR PAX OXYGEN GENERATOR LANYARD CONNECTING POINT ATTACHMENT MAY BE INCORRECT DUE TO UNCLR ENGINEERING INSTRUCTIONS.

Narrative: WHILE PERFORMING LANYARD CHANGE FOR ECO X, L GENERATOR LANYARD WAS INADVERTENTLY CHANGED. CONNECTING POINT ATTACHMENT CONFIGN MAY ALSO BE AN ISSUE, AS PER PAPERWORK BEING UNCLR.

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.