A CL65 in climb out at 2000 ft when switching from APU to engine pneumatics right pack tripped twice...

Attributes
ACN	725573
Time
Date	200701
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : clt.tracon
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65 Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	climbout : initial
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	725573
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : far non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : pack hi press warning other flight crewa other flight crewb
Resolutory Action	other
Consequence	other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : fault isolation performance deficiency : repair performance deficiency : testing
Supplementary
Problem Areas	Environmental Factor Chart Or Publication Aircraft Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

Maintenance not being able to simulate flight problems on the ground. On first attempt to switch bleeds from APU to engines; we experienced a right pack high pressure annunciation. Ran QRH and pack reset. Second attempt to switch right pack high pressure annunciation and left pack went to zero output (unpressurized flight). Notified ATC leveled at 8000 ft. Within seconds of the pack tripping off we received an APU over temperature annunciation. Ran QRH and shut down APU; and was restr from restarting. We were able to reset the left pack to re-establish pressurization and air conditioning. Contacted maintenance on radio and was directed to return to field. When advised of overweight they also instructed us to burn off fuel. After burning down to maximum landing weight; 1 hour 30 mins; landed; taxied; and deplaned without incident. Maintenance history: packs were written up the day before (somewhat related problem); MEL'ed event morning and cleared before our flight! Multiple annunciations. Same as above narrative. Callback conversation with reporter revealed the following information: the reporter stated the airplane was dispatched after maintenance accomplished a ground run and could not duplicate the pneumatic pack failures reported the previous day. The right pack failed on climb out at 2000 ft; but reset only to trip off for overpressure again and then the left pack failed. The airplane has been fixed and is flying; but the maintenance action is unknown.

Original NASA ASRS Text

Title: A CL65 IN CLBOUT AT 2000 FT WHEN SWITCHING FROM APU TO ENG PNEUMATICS R PACK TRIPPED TWICE AND L PACK WENT TO ZERO. RETURNED TO DEP ARPT.

Narrative: MAINT NOT BEING ABLE TO SIMULATE FLT PROBS ON THE GND. ON FIRST ATTEMPT TO SWITCH BLEEDS FROM APU TO ENGS; WE EXPERIENCED A R PACK HIGH PRESSURE ANNUNCIATION. RAN QRH AND PACK RESET. SECOND ATTEMPT TO SWITCH R PACK HIGH PRESSURE ANNUNCIATION AND L PACK WENT TO ZERO OUTPUT (UNPRESSURIZED FLT). NOTIFIED ATC LEVELED AT 8000 FT. WITHIN SECONDS OF THE PACK TRIPPING OFF WE RECEIVED AN APU OVER TEMP ANNUNCIATION. RAN QRH AND SHUT DOWN APU; AND WAS RESTR FROM RESTARTING. WE WERE ABLE TO RESET THE L PACK TO RE-ESTABLISH PRESSURIZATION AND AIR CONDITIONING. CONTACTED MAINT ON RADIO AND WAS DIRECTED TO RETURN TO FIELD. WHEN ADVISED OF OVERWT THEY ALSO INSTRUCTED US TO BURN OFF FUEL. AFTER BURNING DOWN TO MAX LNDG WT; 1 HR 30 MINS; LANDED; TAXIED; AND DEPLANED WITHOUT INCIDENT. MAINT HISTORY: PACKS WERE WRITTEN UP THE DAY BEFORE (SOMEWHAT RELATED PROB); MEL'ED EVENT MORNING AND CLRED BEFORE OUR FLT! MULTIPLE ANNUNCIATIONS. SAME AS ABOVE NARRATIVE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE AIRPLANE WAS DISPATCHED AFTER MAINT ACCOMPLISHED A GND RUN AND COULD NOT DUPLICATE THE PNEUMATIC PACK FAILURES RPTED THE PREVIOUS DAY. THE R PACK FAILED ON CLBOUT AT 2000 FT; BUT RESET ONLY TO TRIP OFF FOR OVERPRESSURE AGAIN AND THEN THE L PACK FAILED. THE AIRPLANE HAS BEEN FIXED AND IS FLYING; BUT THE MAINT ACTION IS UNKNOWN.

Data retrieved from NASA's ASRS site as of January 2009 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.

A CL65 in climb out at 2000 ft when switching from APU to engine pneumatics right pack tripped twice and left pack went to zero. Returned to departure airport.