A dehavilland -8-300 was dispatched in non compliance with the incorrect APU engine sequence unit installed. Caused by confusing maintenance computer note.

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Attributes
ACN	576759
Time
Date	200303
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Dash 8-300
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : airframe technician : powerplant
Experience	maintenance technician : 5
ASRS Report	576759
Person 2
Affiliation	company : air carrier
Function	maintenance : lead technician
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : far non adherence : published procedure
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	contributing factor : non availability of parts contributing factor : manuals performance deficiency : logbook entry
Supplementary
Problem Areas	Maintenance Human Performance Chart Or Publication Aircraft
Primary Problem	Chart Or Publication

Narrative:

A dash-8-300 aircraft came to routine overnight check maintenance with the APU MEL. I installed the APU test box and troubleshot the system. The esu (engine sequence unit) was determined to be the cause of the malfunction. I order the esu and maintenance computer showed the part as nis. Maintenance computer also had a note which I interpreted as giving an alternate part number. I was not sure I was interpreting the note correctly, so I asked my lead to read the note and what he thought it meant. The dash-8-300 aircraft uses a 303 esu and has a b-model APU. The note refers to a 600 series esu. I interpreted the note to indicate that it was now ok to place a 600 series esu on the b-model APU. This note should be rephrased or removed from maintenance computer. Without this note in maintenance computer I would not have considered placing a 600 series esu on a b-model APU, because of the part number in note in the maintenance manual.

Original NASA ASRS Text

Title: A DEHAVILLAND -8-300 WAS DISPATCHED IN NON COMPLIANCE WITH THE INCORRECT APU ENG SEQUENCE UNIT INSTALLED. CAUSED BY CONFUSING MAINT COMPUTER NOTE.

Narrative: A DASH-8-300 ACFT CAME TO ROUTINE OVERNIGHT CHK MAINT WITH THE APU MEL. I INSTALLED THE APU TEST BOX AND TROUBLESHOT THE SYS. THE ESU (ENG SEQUENCE UNIT) WAS DETERMINED TO BE THE CAUSE OF THE MALFUNCTION. I ORDER THE ESU AND MAINT COMPUTER SHOWED THE PART AS NIS. MAINT COMPUTER ALSO HAD A NOTE WHICH I INTERPRETED AS GIVING AN ALTERNATE PART NUMBER. I WAS NOT SURE I WAS INTERPRETING THE NOTE CORRECTLY, SO I ASKED MY LEAD TO READ THE NOTE AND WHAT HE THOUGHT IT MEANT. THE DASH-8-300 ACFT USES A 303 ESU AND HAS A B-MODEL APU. THE NOTE REFERS TO A 600 SERIES ESU. I INTERPRETED THE NOTE TO INDICATE THAT IT WAS NOW OK TO PLACE A 600 SERIES ESU ON THE B-MODEL APU. THIS NOTE SHOULD BE REPHRASED OR REMOVED FROM MAINT COMPUTER. WITHOUT THIS NOTE IN MAINT COMPUTER I WOULD NOT HAVE CONSIDERED PLACING A 600 SERIES ESU ON A B-MODEL APU, BECAUSE OF THE PART NUMBER IN NOTE IN THE MAINT MANUAL.

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.