<< >> NASA ASRS Report 1002635, April 2012

An MD82 climbing to FL340 with anti-ice began an uncommanded descent at FL327 because of poor aircraft performance and so requested a descent to FL320.

Attributes
ACN	1002635
Time
Date	201204
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	MD-82
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Not Flying First Officer
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Inflight Event / Encounter Weather / Turbulence

Narrative:

Climbing out to FL340; aircraft stopped climbing at FL327; mach .740 decreased to mach .730. We requested descent to FL320. Aircraft began descent in IAS/mach to FL325 before clearance received. ATC comment was that we were already descending to FL320; and then he gave us the clearance. We told ATC it was due to icing and aircraft performance. Performance charts indicated that a climb to FL340 with anti-ice on was ok. Light rime ice on windshield wiper nut and light turbulence.

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Original NASA ASRS Text

Title: An MD82 climbing to FL340 with anti-ice began an uncommanded descent at FL327 because of poor aircraft performance and so requested a descent to FL320.

Narrative: Climbing out to FL340; aircraft stopped climbing at FL327; Mach .740 decreased to Mach .730. We requested descent to FL320. Aircraft began descent in IAS/MACH to FL325 before clearance received. ATC comment was that we were already descending to FL320; and then he gave us the clearance. We told ATC it was due to icing and aircraft performance. Performance charts indicated that a climb to FL340 with anti-ice on was OK. Light rime ice on windshield wiper nut and light turbulence.

Data retrieved from NASA's ASRS site as of July 2013 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.