|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Locale Reference||atc facility : sps|
|Altitude||msl bound lower : 31000|
msl bound upper : 31000
|Controlling Facilities||artcc : zfw|
|Operator||common carrier : air carrier|
|Make Model Name||MD-80 Super 80|
|Operating Under FAR Part||Part 121|
|Navigation In Use||Other|
|Flight Phase||cruise other|
|Affiliation||company : air carrier|
|Function||flight crew : captain|
oversight : pic
|Qualification||pilot : atp|
|Affiliation||company : air carrier|
|Function||flight crew : first officer|
|Qualification||pilot : commercial|
pilot : instrument
|Anomaly||aircraft equipment problem : critical|
other anomaly other
|Independent Detector||other flight crewa|
|Resolutory Action||none taken : unable|
|Consequence||faa : reviewed incident with flight crew|
|Air Traffic Incident||other|
While flying at FL310 using the engine and wing anti-ice system, the flow light illuminated and the cabin began to climb at 500-700 FPM. Followed procedure in quick reference handbook but no help. Power was increased but no help. Engine and wing anti-ice had to be turned off to maintain cabin altitude. During recurrent training this subject came up from the experiences of other md-80 pilots. This training helped me handle this situation. I feel that an operations bulletin should be issued concerning this problem and the quick reference handbook should also be updated for this procedure. Callback conversation with reporter revealed the following information: the reporter stated that they were in and out of the clouds and they had the anti-ice system on as a precautionary measure when the 'flow light' came on. They confirmed the condition by checking the cabin rate of climb indicator. They decided to discontinue anti-icing at that time. Later at an intermediate leveloff altitude of 15000 ft, they again put on the anti-icing system and even at high thrust settings (with speed brakes extended) the cabin altitude began to climb forcing them to discontinue using anti-ice. There was an air carrier inspector in the jump seat and he and the flight crew discussed the situation as it occurred.
Original NASA ASRS Text
Title: ACFT EQUIP PROB. ACFT EQUIP DESIGN.
Narrative: WHILE FLYING AT FL310 USING THE ENG AND WING ANTI-ICE SYS, THE FLOW LIGHT ILLUMINATED AND THE CABIN BEGAN TO CLB AT 500-700 FPM. FOLLOWED PROC IN QUICK REF HANDBOOK BUT NO HELP. PWR WAS INCREASED BUT NO HELP. ENG AND WING ANTI-ICE HAD TO BE TURNED OFF TO MAINTAIN CABIN ALT. DURING RECURRENT TRAINING THIS SUBJECT CAME UP FROM THE EXPERIENCES OF OTHER MD-80 PLTS. THIS TRAINING HELPED ME HANDLE THIS SIT. I FEEL THAT AN OPS BULLETIN SHOULD BE ISSUED CONCERNING THIS PROB AND THE QUICK REF HANDBOOK SHOULD ALSO BE UPDATED FOR THIS PROC. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT THEY WERE IN AND OUT OF THE CLOUDS AND THEY HAD THE ANTI-ICE SYS ON AS A PRECAUTIONARY MEASURE WHEN THE 'FLOW LIGHT' CAME ON. THEY CONFIRMED THE CONDITION BY CHKING THE CABIN RATE OF CLB INDICATOR. THEY DECIDED TO DISCONTINUE ANTI-ICING AT THAT TIME. LATER AT AN INTERMEDIATE LEVELOFF ALT OF 15000 FT, THEY AGAIN PUT ON THE ANTI-ICING SYS AND EVEN AT HIGH THRUST SETTINGS (WITH SPD BRAKES EXTENDED) THE CABIN ALT BEGAN TO CLB FORCING THEM TO DISCONTINUE USING ANTI-ICE. THERE WAS AN ACR INSPECTOR IN THE JUMP SEAT AND HE AND THE FLC DISCUSSED THE SIT AS IT OCCURRED.
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.