Air carrier flight crew did not meet altitude crossing and speed restr due to mis- program of FMS.

Attributes
ACN	310312
Time
Date	199507
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : mod
State Reference	CA
Altitude	msl bound lower : 11000 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zoa
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	arrival other arrival star : star enroute airway : zoa
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : atp pilot : commercial pilot : flight engineer
Experience	flight time last 90 days : 180 flight time total : 21000 flight time type : 800
ASRS Report	310312
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer pilot : cfi
Experience	flight time last 90 days : 240 flight time total : 11000 flight time type : 240
ASRS Report	310000
Events
Anomaly	altitude deviation : crossing restriction not met altitude deviation : undershoot non adherence : clearance non adherence : far other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

En route to sfo we had programmed the computer for modesto 2 arrival to cross cedes at 250 KTS and 11000 ft. When adding the FMS runway 28R approach while still at cruising altitude just prior to our computed descent point, the cedes restr dropped out without our noticing it (we were preoccupied with other duties and the VNAV path showed right on). I suddenly noticed the computer glitch and commenced a full drag descent. About this time center asked us if we could still make the cedes restr. We said yes but we might be a little fast. When it became apparent to us that we could not make the restr we tried to advise center but got no acknowledgement. We crossed cedes around 12000 ft at 300 KTS. I know one should always back up the FMS but there are times when one becomes very busy in a 2 pilot cockpit and one relies on the computer. This time it bit us. Supplemental information from acn 310000: when ATC again specified cedes at 11000 ft and 250 KTS we were descending in VNAV and the captain was making the PA. I relayed the restr again but was focused erroneously on the fact that it was after the hour and no current ATIS.

Original NASA ASRS Text

Title: ACR FLC DID NOT MEET ALT XING AND SPD RESTR DUE TO MIS- PROGRAM OF FMS.

Narrative: ENRTE TO SFO WE HAD PROGRAMMED THE COMPUTER FOR MODESTO 2 ARR TO CROSS CEDES AT 250 KTS AND 11000 FT. WHEN ADDING THE FMS RWY 28R APCH WHILE STILL AT CRUISING ALT JUST PRIOR TO OUR COMPUTED DSCNT POINT, THE CEDES RESTR DROPPED OUT WITHOUT OUR NOTICING IT (WE WERE PREOCCUPIED WITH OTHER DUTIES AND THE VNAV PATH SHOWED RIGHT ON). I SUDDENLY NOTICED THE COMPUTER GLITCH AND COMMENCED A FULL DRAG DSCNT. ABOUT THIS TIME CTR ASKED US IF WE COULD STILL MAKE THE CEDES RESTR. WE SAID YES BUT WE MIGHT BE A LITTLE FAST. WHEN IT BECAME APPARENT TO US THAT WE COULD NOT MAKE THE RESTR WE TRIED TO ADVISE CTR BUT GOT NO ACKNOWLEDGEMENT. WE CROSSED CEDES AROUND 12000 FT AT 300 KTS. I KNOW ONE SHOULD ALWAYS BACK UP THE FMS BUT THERE ARE TIMES WHEN ONE BECOMES VERY BUSY IN A 2 PLT COCKPIT AND ONE RELIES ON THE COMPUTER. THIS TIME IT BIT US. SUPPLEMENTAL INFO FROM ACN 310000: WHEN ATC AGAIN SPECIFIED CEDES AT 11000 FT AND 250 KTS WE WERE DSNDING IN VNAV AND THE CAPT WAS MAKING THE PA. I RELAYED THE RESTR AGAIN BUT WAS FOCUSED ERRONEOUSLY ON THE FACT THAT IT WAS AFTER THE HR AND NO CURRENT ATIS.

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.