Flight crew of medium large transport air carrier aircraft failed to turn on power from the engines ...

Attributes
ACN	236875
Time
Date	199303
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : cle
State Reference	OH
Altitude	msl bound lower : 21000 msl bound upper : 22000
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude descent other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 10000 flight time type : 450
ASRS Report	236875
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : instrument pilot : private pilot : atp pilot : commercial
Experience	flight time last 90 days : 160 flight time total : 3000 flight time type : 350
ASRS Report	237192
Events
Anomaly	aircraft equipment problem : critical non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

After departing the gate in cle we deiced the aircraft as per our operations manual. The copilot turned off both packs, he commented that he needed to turn the packs on after the 1 min wait time. While waiting we received taxi clearance and starting a taxi on the ice and snow contaminated ramp. ATC gave us clearance to follow traffic, after locating the traffic we did as instructed. The snow was actively falling and the taxi conditions were not the best. We ran all checklists, including the deice holdover checklists. First officer received closeout information and computed a V1 correction. After all checklists were complete, we departed cle with anti-ice on. No problems until reaching 21000-22000 ft when we received a cabin altitude alert on our MFDU. We assessed the problem, tried to 'catch' cabin with manual control but no help. I asked copilot to ask ATC for a lower altitude which was granted -- 11000 ft. We started descending and the passenger masks deployed when cabin reached 14000 ft. The cabin climbed to 14500 ft prior to us intercepting the cabin in our descent. We received further descent to 10000 ft and told passenger to discontinue use of oxygen. After running all checklists, I finally noticed the pack switches off. The off lights were very dim, and in no way were obvious that they were off. I turned them back on and repressurized the cabin. We calculated a new fuel burn to rdu, called our dispatch, told passenger problem was fixed and the aircraft was working the way it was designed. We continued to rdu with no other problems.

Original NASA ASRS Text

Title: FLC OF MLG ACR ACFT FAILED TO TURN ON PWR FROM THE ENGS FOR AUTO CABIN PRESSURIZATION DUE TO GND DEICING DISTR.

Narrative: AFTER DEPARTING THE GATE IN CLE WE DEICED THE ACFT AS PER OUR OPS MANUAL. THE COPLT TURNED OFF BOTH PACKS, HE COMMENTED THAT HE NEEDED TO TURN THE PACKS ON AFTER THE 1 MIN WAIT TIME. WHILE WAITING WE RECEIVED TAXI CLRNC AND STARTING A TAXI ON THE ICE AND SNOW CONTAMINATED RAMP. ATC GAVE US CLRNC TO FOLLOW TFC, AFTER LOCATING THE TFC WE DID AS INSTRUCTED. THE SNOW WAS ACTIVELY FALLING AND THE TAXI CONDITIONS WERE NOT THE BEST. WE RAN ALL CHKLISTS, INCLUDING THE DEICE HOLDOVER CHKLISTS. FO RECEIVED CLOSEOUT INFO AND COMPUTED A V1 CORRECTION. AFTER ALL CHKLISTS WERE COMPLETE, WE DEPARTED CLE WITH ANTI-ICE ON. NO PROBS UNTIL REACHING 21000-22000 FT WHEN WE RECEIVED A CABIN ALT ALERT ON OUR MFDU. WE ASSESSED THE PROB, TRIED TO 'CATCH' CABIN WITH MANUAL CTL BUT NO HELP. I ASKED COPLT TO ASK ATC FOR A LOWER ALT WHICH WAS GRANTED -- 11000 FT. WE STARTED DSNDING AND THE PAX MASKS DEPLOYED WHEN CABIN REACHED 14000 FT. THE CABIN CLBED TO 14500 FT PRIOR TO US INTERCEPTING THE CABIN IN OUR DSCNT. WE RECEIVED FURTHER DSCNT TO 10000 FT AND TOLD PAX TO DISCONTINUE USE OF OXYGEN. AFTER RUNNING ALL CHKLISTS, I FINALLY NOTICED THE PACK SWITCHES OFF. THE OFF LIGHTS WERE VERY DIM, AND IN NO WAY WERE OBVIOUS THAT THEY WERE OFF. I TURNED THEM BACK ON AND REPRESSURIZED THE CABIN. WE CALCULATED A NEW FUEL BURN TO RDU, CALLED OUR DISPATCH, TOLD PAX PROB WAS FIXED AND THE ACFT WAS WORKING THE WAY IT WAS DESIGNED. WE CONTINUED TO RDU WITH NO OTHER PROBS.

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.

Flight crew of medium large transport air carrier aircraft failed to turn on power from the engines for automatic cabin pressurization due to ground deicing distraction.