Captain of an light transport cargo jet missed SID departure turn due to distraction of problem with cabin pressurization system. ATC intervened to advise crew that they were shown off course and first officer requested clearance to return and land.

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Attributes
ACN	397096
Time
Date	199803
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : pdz airport : ont
State Reference	CA
Altitude	msl bound lower : 7000 msl bound upper : 7000
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 135
Flight Phase	climbout : intermediate altitude
Route In Use	departure other departure sid : sid enroute airway : ont
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 3300 flight time type : 300
ASRS Report	397096
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe other anomaly other other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Captain was flying, I (first officer) was talking on the radio. The cabin would not pressurize. I was performing the procedure to switch pressurization to manual. The captain missed a turn on the prado five departure, thermal transition. I requested to return to the airport and advised ATC that we could not pressurize the cabin as the reason for returning. That was when ATC advised us that we were off course.

Original NASA ASRS Text

Title: CAPT OF AN LTT CARGO JET MISSED SID DEP TURN DUE TO DISTR OF PROB WITH CABIN PRESSURIZATION SYS. ATC INTERVENED TO ADVISE CREW THAT THEY WERE SHOWN OFF COURSE AND FO REQUESTED CLRNC TO RETURN AND LAND.

Narrative: CAPT WAS FLYING, I (FO) WAS TALKING ON THE RADIO. THE CABIN WOULD NOT PRESSURIZE. I WAS PERFORMING THE PROC TO SWITCH PRESSURIZATION TO MANUAL. THE CAPT MISSED A TURN ON THE PRADO FIVE DEP, THERMAL TRANSITION. I REQUESTED TO RETURN TO THE ARPT AND ADVISED ATC THAT WE COULD NOT PRESSURIZE THE CABIN AS THE REASON FOR RETURNING. THAT WAS WHEN ATC ADVISED US THAT WE WERE OFF COURSE.

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.