An air carrier 'glass cockpit' large transport may have missed an altitude restriction on a profile ...

Attributes
ACN	243419
Time
Date	199306
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : yyz
State Reference	ON
Altitude	msl bound lower : 11000 msl bound upper : 11500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	arrival : profile descent arrival other enroute airway : czyz
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 10000
ASRS Report	243419
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical altitude deviation : crossing restriction not met altitude deviation : undershoot non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	flight crew : became reoriented flight crew : overcame equipment problem flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Cleared from yxu to ywt, profile descent runway 24. While still southwest of ywt, both FMC's failed. We attempted to reestablish a route but computer would not accept input. While tuning vors for raw data, center asked if we would make the 11000 ft restriction at ricki. When DME locked on we were inside ricki but level at 11000 ft. Toronto center apparently felt like we missed our altitude at ricki.

Original NASA ASRS Text

Title: AN ACR 'GLASS COCKPIT' LGT MAY HAVE MISSED AN ALT RESTRICTION ON A PROFILE DSCNT.

Narrative: CLRED FROM YXU TO YWT, PROFILE DSCNT RWY 24. WHILE STILL SW OF YWT, BOTH FMC'S FAILED. WE ATTEMPTED TO REESTABLISH A RTE BUT COMPUTER WOULD NOT ACCEPT INPUT. WHILE TUNING VORS FOR RAW DATA, CTR ASKED IF WE WOULD MAKE THE 11000 FT RESTRICTION AT RICKI. WHEN DME LOCKED ON WE WERE INSIDE RICKI BUT LEVEL AT 11000 FT. TORONTO CTR APPARENTLY FELT LIKE WE MISSED OUR ALT AT RICKI.

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.

An air carrier 'glass cockpit' large transport may have missed an altitude restriction on a profile descent.