<< >> NASA ASRS Report 539765, February 2002

Smoke in cockpit after an APU failure with a deferred air conditioning system mandates a return land for the crew in a DO328 departure bos, ma.

Attributes
ACN	539765
Time
Date	200202
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : bos.vortac
State Reference	MA
Altitude	msl single value : 2000
Environment
Flight Conditions	IMC
Weather Elements	Snow
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : a90.tracon
Operator	common carrier : air carrier
Make Model Name	Do 328 TP (Turboprop)
Operating Under FAR Part	Part 121
Navigation In Use	other other vortac
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : ns
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : multi engine pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 2050 flight time type : 550
ASRS Report	539765
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical other anomaly
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : provided flight assist flight crew : diverted to another airport flight crew : landed as precaution other
Consequence	other other Other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Pre-existing conditions: left heat exchanger fan deferred/recirculation fan deferred. This requires that the APU bleed be the only source of cabin air for takeoff through 1500 ft AGL. This also means that cabin air circulation will be minimal until left bleed selected above 1500 ft AGL and 160 KTS because of the heat exchanger fan deferral. We had been thoroughly deiced at the gate. Situation: before takeoff, I deselected the right engine bleed source and selected the APU bleed source per deferral procedures. The right pack was on, the left pack off -- also per the deferral procedures. At 1500 ft AGL, as I was reaching to deselect the APU bleed and select the left and right engine bleeds and left pack, APU generator overheat crew alert system appeared immediately followed by smoke entering the cockpit through the vents by the windscreen. We complied with memory items for smoke and the captain deselected the APU generator. Smoke immediately stopped and dissipated. We requested delaying vectors and completed smoke and electrical smoke qrc/QRH procedures. About 5 mins after the smoke cleared, we had a blue status cas right pack fail. I was unable to reset the pack successfully and we returned to the field with both packs, bleeds and APU bleed selected off. The landing was normal, the aircraft was searched by firemen after the passenger were deplaned at the gate. No smoke entered or was evident in the cabin because of the heat exchanger fan deferral.

Related reports:

• A DC9-40 has one air conditioning pack as a deferred item. O...

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Original NASA ASRS Text

Title: SMOKE IN COCKPIT AFTER AN APU FAILURE WITH A DEFERRED AIR CONDITIONING SYS MANDATES A RETURN LAND FOR THE CREW IN A DO328 DEP BOS, MA.

Narrative: PRE-EXISTING CONDITIONS: L HEAT EXCHANGER FAN DEFERRED/RECIRCULATION FAN DEFERRED. THIS REQUIRES THAT THE APU BLEED BE THE ONLY SOURCE OF CABIN AIR FOR TKOF THROUGH 1500 FT AGL. THIS ALSO MEANS THAT CABIN AIR CIRCULATION WILL BE MINIMAL UNTIL L BLEED SELECTED ABOVE 1500 FT AGL AND 160 KTS BECAUSE OF THE HEAT EXCHANGER FAN DEFERRAL. WE HAD BEEN THOROUGHLY DEICED AT THE GATE. SIT: BEFORE TKOF, I DESELECTED THE R ENG BLEED SOURCE AND SELECTED THE APU BLEED SOURCE PER DEFERRAL PROCS. THE R PACK WAS ON, THE L PACK OFF -- ALSO PER THE DEFERRAL PROCS. AT 1500 FT AGL, AS I WAS REACHING TO DESELECT THE APU BLEED AND SELECT THE L AND R ENG BLEEDS AND L PACK, APU GENERATOR OVERHEAT CREW ALERT SYSTEM APPEARED IMMEDIATELY FOLLOWED BY SMOKE ENTERING THE COCKPIT THROUGH THE VENTS BY THE WINDSCREEN. WE COMPLIED WITH MEMORY ITEMS FOR SMOKE AND THE CAPT DESELECTED THE APU GENERATOR. SMOKE IMMEDIATELY STOPPED AND DISSIPATED. WE REQUESTED DELAYING VECTORS AND COMPLETED SMOKE AND ELECTRICAL SMOKE QRC/QRH PROCS. ABOUT 5 MINS AFTER THE SMOKE CLRED, WE HAD A BLUE STATUS CAS R PACK FAIL. I WAS UNABLE TO RESET THE PACK SUCCESSFULLY AND WE RETURNED TO THE FIELD WITH BOTH PACKS, BLEEDS AND APU BLEED SELECTED OFF. THE LNDG WAS NORMAL, THE ACFT WAS SEARCHED BY FIREMEN AFTER THE PAX WERE DEPLANED AT THE GATE. NO SMOKE ENTERED OR WAS EVIDENT IN THE CABIN BECAUSE OF THE HEAT EXCHANGER FAN DEFERRAL.

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.