<< >> NASA ASRS Report 806921, October 2008

B737-400 flight crew receives false raas 'on taxiway' warning on takeoff roll. Opt to continue takeoff.

Attributes
ACN	806921
Time
Date	200810
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 210 flight time type : 6700
ASRS Report	806921
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Supplementary
Problem Areas	Flight Crew Human Performance Company Aircraft
Primary Problem	Aircraft

Narrative:

On takeoff roll from new runway 29 threshold at 80-100 KTS; raas gave a very loud 'on taxiway; on taxiway' warning. We verified that we were in fact on runway 29 and continued takeoff roll. Management must provide clear guidance for what to do when receiving raas warnings for possible hazard (as for windshear or ground proximity). Better yet; remove raas from all aircraft until false warnings are eliminated. In absence of such guidance; best option may be to abort takeoff roll for unanticipated 'on taxiway' warnings during takeoff.

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Original NASA ASRS Text

Title: B737-400 FLT CREW RECEIVES FALSE RAAS 'ON TXWY' WARNING ON TKOF ROLL. OPT TO CONTINUE TKOF.

Narrative: ON TKOF ROLL FROM NEW RWY 29 THRESHOLD AT 80-100 KTS; RAAS GAVE A VERY LOUD 'ON TXWY; ON TXWY' WARNING. WE VERIFIED THAT WE WERE IN FACT ON RWY 29 AND CONTINUED TKOF ROLL. MGMNT MUST PROVIDE CLEAR GUIDANCE FOR WHAT TO DO WHEN RECEIVING RAAS WARNINGS FOR POSSIBLE HAZARD (AS FOR WINDSHEAR OR GND PROX). BETTER YET; REMOVE RAAS FROM ALL ACFT UNTIL FALSE WARNINGS ARE ELIMINATED. IN ABSENCE OF SUCH GUIDANCE; BEST OPTION MAY BE TO ABORT TKOF ROLL FOR UNANTICIPATED 'ON TXWY' WARNINGS DURING TKOF.

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.