<< >> NASA ASRS Report 357792, January 1997

A B757 with 1 engine anti-ice system inoperative and deferred was dispatched into visible moisture and OAT 10 degrees or below. Did not satisfy MEL requirements.

Attributes
ACN	357792
Time
Date	199701
Day	Mon
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : zdv
State Reference	CO
Altitude	msl bound lower : 21000 msl bound upper : 21000
Environment
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other descent other
Route In Use	enroute airway : zdv
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp pilot : instrument
Experience	flight time last 90 days : 160 flight time total : 12000 flight time type : 3000
ASRS Report	357792
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical inflight encounter : weather non adherence : far non adherence : published procedure other anomaly other
Independent Detector	other other : unspecified
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Air Traffic Incident	Pilot Deviation other

Narrative:

Engine bleed air valve rendered inoperative at sfo. No engine anti-ice available. I checked with dispatch and was assured that the WX between sfo and den was good and no icing conditions existed. I agreed to take the aircraft under these conditions. En route to den (about 180 mi west of den) it became apparent to me that we would have to descend through cloud cover to get into den. The B757 requires the use of engine anti-ice when descending through visible moisture when the tat is 10 degrees C or below. I asked ATC for a lower altitude due to this requirement. I descended quickly (with the aid of speed brakes) through the cloud cover to minimize our time in the cloud cover. We remained between cloud layers until we reached denver.

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Original NASA ASRS Text

Title: A B757 WITH 1 ENG ANTI-ICE SYS INOP AND DEFERRED WAS DISPATCHED INTO VISIBLE MOISTURE AND OAT 10 DEGS OR BELOW. DID NOT SATISFY MEL REQUIREMENTS.

Narrative: ENG BLEED AIR VALVE RENDERED INOP AT SFO. NO ENG ANTI-ICE AVAILABLE. I CHKED WITH DISPATCH AND WAS ASSURED THAT THE WX BTWN SFO AND DEN WAS GOOD AND NO ICING CONDITIONS EXISTED. I AGREED TO TAKE THE ACFT UNDER THESE CONDITIONS. ENRTE TO DEN (ABOUT 180 MI W OF DEN) IT BECAME APPARENT TO ME THAT WE WOULD HAVE TO DSND THROUGH CLOUD COVER TO GET INTO DEN. THE B757 REQUIRES THE USE OF ENG ANTI-ICE WHEN DSNDING THROUGH VISIBLE MOISTURE WHEN THE TAT IS 10 DEGS C OR BELOW. I ASKED ATC FOR A LOWER ALT DUE TO THIS REQUIREMENT. I DSNDED QUICKLY (WITH THE AID OF SPD BRAKES) THROUGH THE CLOUD COVER TO MINIMIZE OUR TIME IN THE CLOUD COVER. WE REMAINED BTWN CLOUD LAYERS UNTIL WE REACHED DENVER.

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.