A B737-800 aircraft #2 engine generator deferred inoperative. MEL did not specify to visually check APU oil level; so oil level was accomplished via cockpit CDU 'bite' system; oil checked full. APU ran out of oil; flight diverted.

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Attributes
ACN	754012
Time
Date	200709
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : powerplant technician : airframe
ASRS Report	754012
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : diverted to another airport
Consequence	other
Factors
Maintenance	contributing factor : manuals
Supplementary
Problem Areas	Chart Or Publication Aircraft
Primary Problem	Chart Or Publication
Situations
Publication	MEL Procedures

Narrative:

Aircraft had #2 engine generator inoperative. Placarded (inoperative) per MEL; proceeded to follow maintenance procedures; checked APU oil using cockpit CDU through APU bite; oil level on CDU read full. Did not check visually; MEL does not specify to check oil 'visually.' APU ran out of oil on trip to ZZZ1; diverted. MEL does not specify to check APU oil visually. APU oil quantity monitoring system may not be reading correctly.

Original NASA ASRS Text

Title: A B737-800 ACFT #2 ENG GENERATOR DEFERRED INOP. MEL DID NOT SPECIFY TO VISUALLY CHECK APU OIL LEVEL; SO OIL LEVEL WAS ACCOMPLISHED VIA COCKPIT CDU 'BITE' SYS; OIL CHECKED FULL. APU RAN OUT OF OIL; FLIGHT DIVERTED.

Narrative: ACFT HAD #2 ENG GENERATOR INOP. PLACARDED (INOP) PER MEL; PROCEEDED TO FOLLOW MAINT PROCS; CHKED APU OIL USING COCKPIT CDU THROUGH APU BITE; OIL LEVEL ON CDU READ FULL. DID NOT CHK VISUALLY; MEL DOES NOT SPECIFY TO CHK OIL 'VISUALLY.' APU RAN OUT OF OIL ON TRIP TO ZZZ1; DIVERTED. MEL DOES NOT SPECIFY TO CHK APU OIL VISUALLY. APU OIL QUANTITY MONITORING SYS MAY NOT BE READING CORRECTLY.

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.