<< >> NASA ASRS Report 542195, March 2002

B737-400 crew used flaps 5 degree takeoff speeds when they were required to use flaps 15 degrees because of performance considerations.

Attributes
ACN	542195
Time
Date	200203
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sna.airport
State Reference	CA
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	ground : taxi ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	542195
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	542196
Events
Anomaly	non adherence : company policies non adherence : far non adherence : published procedure other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other
Supplementary
Problem Areas	FAA Aircraft Company Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Takeoff weight from sna in a B737-400 dictated a flaps 15 degree bleeds off takeoff. The B737-400 FMC takeoff data page defaults to flaps 5 degrees. FMC database 10.4 allows line selection of takeoff 'V' speeds without reference to a separate data card. Neither pilot recognized the inadvertent selection of flaps 5 degree speeds for a flaps 15 degree takeoff until after takeoff. In lieu of reintroducing the takeoff data card, 2 corrective actions could be recommended: 1) interim fix: responses to flaps on taxi and takeoff checklists could be amended to 'X degrees (flap lever), X degrees (FMC flap selection, X degrees (flap position indicator) green light.' 2) long term solution, modify the B737-400 FMC takeoff data page to function like the B737-700/900, ie, the desired flap setting must be made by manual input for each takeoff.

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Original NASA ASRS Text

Title: B737-400 CREW USED FLAPS 5 DEG TKOF SPDS WHEN THEY WERE REQUIRED TO USE FLAPS 15 DEGS BECAUSE OF PERFORMANCE CONSIDERATIONS.

Narrative: TKOF WT FROM SNA IN A B737-400 DICTATED A FLAPS 15 DEG BLEEDS OFF TKOF. THE B737-400 FMC TKOF DATA PAGE DEFAULTS TO FLAPS 5 DEGS. FMC DATABASE 10.4 ALLOWS LINE SELECTION OF TKOF 'V' SPDS WITHOUT REF TO A SEPARATE DATA CARD. NEITHER PLT RECOGNIZED THE INADVERTENT SELECTION OF FLAPS 5 DEG SPDS FOR A FLAPS 15 DEG TKOF UNTIL AFTER TKOF. IN LIEU OF REINTRODUCING THE TKOF DATA CARD, 2 CORRECTIVE ACTIONS COULD BE RECOMMENDED: 1) INTERIM FIX: RESPONSES TO FLAPS ON TAXI AND TKOF CHKLISTS COULD BE AMENDED TO 'X DEGS (FLAP LEVER), X DEGS (FMC FLAP SELECTION, X DEGS (FLAP POS INDICATOR) GREEN LIGHT.' 2) LONG TERM SOLUTION, MODIFY THE B737-400 FMC TKOF DATA PAGE TO FUNCTION LIKE THE B737-700/900, IE, THE DESIRED FLAP SETTING MUST BE MADE BY MANUAL INPUT FOR EACH TKOF.

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.