<< >> NASA ASRS Report 414588, September 1998

An MD80 had a manual revision which changed the numbering of part and component locations causing confusion.

Attributes
ACN	414588
Time
Date	199809
Day	Thu
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz
State Reference	US
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Night
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
Navigation In Use	Other
Flight Phase	other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	414588
Person 2
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	414586
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other other : unspecified
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Air Traffic Incident	other
Situations
Publication	Unspecified

Narrative:

On sep/xy/98, I found out that sectors XY2 and XY3 were possibly misidented on certain MD80 aircraft from apr/yy/98 to now, due to a change in the sector numbers. The change in the sector numbers caused confusion from r-hand to l- hand, the old sector number for l-hand was XYZ1 and r- hand was XYZ2. The new sector number for l-hand is XYZ02 and r-hand is sector XYZ3. The sector numbers were changed from odd to even on the l-hand side and from even to odd north the r-hand side. The shop was not informed of the change on apr/yy/98. The engineering change was unclr on identing l-hand from r-hand. Callback conversation with reporter revealed the following information: the reporter stated the change to the manual caused some confusion as everyone is used to the numbering system used over the yrs as odd on the left and even on the right. The reporter said no prior information was given to the people who use this system in writing up work cards. The reporter stated being employed as a mechanic for 10 yrs.

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Original NASA ASRS Text

Title: AN MD80 HAD A MANUAL REVISION WHICH CHANGED THE NUMBERING OF PART AND COMPONENT LOCATIONS CAUSING CONFUSION.

Narrative: ON SEP/XY/98, I FOUND OUT THAT SECTORS XY2 AND XY3 WERE POSSIBLY MISIDENTED ON CERTAIN MD80 ACFT FROM APR/YY/98 TO NOW, DUE TO A CHANGE IN THE SECTOR NUMBERS. THE CHANGE IN THE SECTOR NUMBERS CAUSED CONFUSION FROM R-HAND TO L- HAND, THE OLD SECTOR NUMBER FOR L-HAND WAS XYZ1 AND R- HAND WAS XYZ2. THE NEW SECTOR NUMBER FOR L-HAND IS XYZ02 AND R-HAND IS SECTOR XYZ3. THE SECTOR NUMBERS WERE CHANGED FROM ODD TO EVEN ON THE L-HAND SIDE AND FROM EVEN TO ODD N THE R-HAND SIDE. THE SHOP WAS NOT INFORMED OF THE CHANGE ON APR/YY/98. THE ENGINEERING CHANGE WAS UNCLR ON IDENTING L-HAND FROM R-HAND. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CHANGE TO THE MANUAL CAUSED SOME CONFUSION AS EVERYONE IS USED TO THE NUMBERING SYS USED OVER THE YRS AS ODD ON THE L AND EVEN ON THE R. THE RPTR SAID NO PRIOR INFO WAS GIVEN TO THE PEOPLE WHO USE THIS SYS IN WRITING UP WORK CARDS. THE RPTR STATED BEING EMPLOYED AS A MECH FOR 10 YRS.

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.