<< >> NASA ASRS Report 400256, April 1998

An air carrier B767 flight crew had an inertial reference system fail during the takeoff run and initial climb. The first officer lost his attitude director indicator and flight director and the captain had to take over flying the aircraft. The captain's instruments and the standby instruments were functioning well.

Attributes
ACN	400256
Time
Date	199804
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : jfk
State Reference	NY
Altitude	agl bound lower : 600 agl bound upper : 600
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : n90
Operator	common carrier : air carrier
Make Model Name	B767-200
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : initial climbout : takeoff
Route In Use	departure other departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : instrument pilot : flight engineer pilot : commercial
Experience	flight time last 90 days : 80 flight time total : 11000 flight time type : 1800
ASRS Report	400256
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : detected after the fact other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

On the takeoff roll my flight director 'V' bar blinked once or twice. Everything else was normal. Pitch attitude indication was normal after rotation. The clearance was runway heading to 1.5 DME and turn right to 100 degrees. After entering the overcast at about 600 ft, tower cleared us to turn right to 100 degrees. I made the usual aileron input to turn right, but my attitude indicator showed level wings. It felt to me that the aircraft did turn to the right so I glanced at the captain's attitude indicator and standby, which both showed a 30 degree angle of bank right turn. I called 'gyro failure' and advised the captain, who took control of the aircraft and continued the turn to 100 degree heading. There were no EICAS status messages or warnings of any kind. After 5 mins the right IRS failed. How can this aircraft be certified for CAT III operation with no pitch, roll, or heading comparison warning system?

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Original NASA ASRS Text

Title: AN ACR B767 FLC HAD AN INERTIAL REF SYS FAIL DURING THE TKOF RUN AND INITIAL CLB. THE FO LOST HIS ATTITUDE DIRECTOR INDICATOR AND FLT DIRECTOR AND THE CAPT HAD TO TAKE OVER FLYING THE ACFT. THE CAPT'S INSTS AND THE STANDBY INSTS WERE FUNCTIONING WELL.

Narrative: ON THE TKOF ROLL MY FLT DIRECTOR 'V' BAR BLINKED ONCE OR TWICE. EVERYTHING ELSE WAS NORMAL. PITCH ATTITUDE INDICATION WAS NORMAL AFTER ROTATION. THE CLRNC WAS RWY HDG TO 1.5 DME AND TURN R TO 100 DEGS. AFTER ENTERING THE OVCST AT ABOUT 600 FT, TWR CLRED US TO TURN R TO 100 DEGS. I MADE THE USUAL AILERON INPUT TO TURN R, BUT MY ATTITUDE INDICATOR SHOWED LEVEL WINGS. IT FELT TO ME THAT THE ACFT DID TURN TO THE R SO I GLANCED AT THE CAPT'S ATTITUDE INDICATOR AND STANDBY, WHICH BOTH SHOWED A 30 DEG ANGLE OF BANK R TURN. I CALLED 'GYRO FAILURE' AND ADVISED THE CAPT, WHO TOOK CTL OF THE ACFT AND CONTINUED THE TURN TO 100 DEG HDG. THERE WERE NO EICAS STATUS MESSAGES OR WARNINGS OF ANY KIND. AFTER 5 MINS THE R IRS FAILED. HOW CAN THIS ACFT BE CERTIFIED FOR CAT III OP WITH NO PITCH, ROLL, OR HDG COMPARISON WARNING SYS?

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.