<< >> NASA ASRS Report 101423, January 1989

Controller cleared aircraft to intercept radial which requires reprogram FMC. Neither pilot flying aircraft using raw data and flew past radial.

Attributes
ACN	101423
Time
Date	198901
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : flw
State Reference	CA
Altitude	msl bound lower : 25000 msl bound upper : 25000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zla
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	enroute airway : zla
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 10500 flight time type : 2200
ASRS Report	101423
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

The controller asked us to intercept a radial to the fellows VOR. Both pilots attempted to reprogram the flight management system, but failed. Neither pilot realized that we had passed the assigned intercept point until the controller assigned a new heading to reintercept the radial. Moral of the story: one pilot should always be following the aircraft's progress using 'raw data,' so that an FMS malfunction can be discovered quickly.

Related reports:

• Small aircraft on IFR flight plan being vectored to intercep...
• G3 aircraft on descent and intercept clearance. Flight crew ...
• Controller intervention to stop aircraft X from making radia...
• SF340 aircraft on vectors for approach and cleared to interc...
• MD80S aircraft on approach had an intercept heading of 195 d...
• MD80S aircraft on intercept for ILS approach, when selecting...

	Enter your search terms Submit search form
	Web www.37000feet.com

Original NASA ASRS Text

Title: CTLR CLEARED ACFT TO INTERCEPT RADIAL WHICH REQUIRES REPROGRAM FMC. NEITHER PLT FLYING ACFT USING RAW DATA AND FLEW PAST RADIAL.

Narrative: THE CTLR ASKED US TO INTERCEPT A RADIAL TO THE FELLOWS VOR. BOTH PLTS ATTEMPTED TO REPROGRAM THE FLT MGMNT SYS, BUT FAILED. NEITHER PLT REALIZED THAT WE HAD PASSED THE ASSIGNED INTERCEPT POINT UNTIL THE CTLR ASSIGNED A NEW HDG TO REINTERCEPT THE RADIAL. MORAL OF THE STORY: ONE PLT SHOULD ALWAYS BE FOLLOWING THE ACFT'S PROGRESS USING 'RAW DATA,' SO THAT AN FMS MALFUNCTION CAN BE DISCOVERED QUICKLY.

Data retrieved from NASA's ASRS site as of August 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.