<< >> NASA ASRS Report 819906, October 2008

A mechanic is informed that a logbook item he had previously cleared and signed off in their B757-200 logbook for an engine pneumatic problem; had reoccurred; causing an air turnback at a different station.

Attributes
ACN	819906
Time
Date	200810
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	ground : parked
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	819906
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure non adherence : far
Independent Detector	other other : 1
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	performance deficiency : installation performance deficiency : testing performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

I cleared item xx on log pager after logbook review. Item states: 2 lines were replaced and a high power run was accomplished. All valves should be operations checked on a high power run and it showed no EICAS messages on the trip to ZZZ. I reasoned the right engine performed normally. On logbook review; 2 chafed lines were replaced in ZZZ1 and a power run accomplished. All tested good. Arrived in ZZZ with no EICAS messages. Reasoned all was working correctly. Callback conversation with reporter revealed the following information: reporter stated the B757-200 had flown two flight legs since the two pneumatic lines had been replaced and at least two more after he cleared the log item. He was informed that maintenance at a different line station found a pneumatic line had disconnected from the high pressure bleed valve on the engine that provides aircraft system manifold pneumatic pressure.

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Original NASA ASRS Text

Title: A Mechanic is informed that a logbook item he had previously cleared and signed off in their B757-200 logbook for an engine pneumatic problem; had reoccurred; causing an air turnback at a different station.

Narrative: I cleared Item XX on log pager after logbook review. Item states: 2 lines were replaced and a high power run was accomplished. All valves should be OPS checked on a high power run and it showed no EICAS messages on the trip to ZZZ. I reasoned the right engine performed normally. On logbook review; 2 chafed lines were replaced in ZZZ1 and a power run accomplished. All tested good. Arrived in ZZZ with no EICAS messages. Reasoned all was working correctly. Callback conversation with Reporter revealed the following information: Reporter stated the B757-200 had flown two flight legs since the two pneumatic lines had been replaced and at least two more after he cleared the log item. He was informed that maintenance at a different line station found a pneumatic line had disconnected from the High Pressure Bleed Valve on the engine that provides aircraft system manifold pneumatic pressure.

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.