Cabin altitude warning sounds at 10000 ft.

Attributes
ACN	237297
Time
Date	199303
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : phx
State Reference	AZ
Altitude	msl bound lower : 10000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute airway : phx
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	237297
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Passing through 10000 ft, 'cabin altitude' warnings sounded. Flight leveled at 10000. Aircraft packs were on but pressure control lever in manual, vice automatic. Had been called out 'automatic' by captain on pre-start checklist and I still think it was because I remember looking right at it (may have made an error). Neither pilot remembers any unusual ear pressure release due to climb, but that may be due to distraction of troubleshooting third altimeter, which had been grossly 'hanging up' and lagging by as much as 1000 ft (vibrator circuit breaker had popped). Cabin pressurized and flight continued.

Original NASA ASRS Text

Title: CABIN ALT WARNING SOUNDS AT 10000 FT.

Narrative: PASSING THROUGH 10000 FT, 'CABIN ALT' WARNINGS SOUNDED. FLT LEVELED AT 10000. ACFT PACKS WERE ON BUT PRESSURE CTL LEVER IN MANUAL, VICE AUTO. HAD BEEN CALLED OUT 'AUTO' BY CAPT ON PRE-START CHKLIST AND I STILL THINK IT WAS BECAUSE I REMEMBER LOOKING RIGHT AT IT (MAY HAVE MADE AN ERROR). NEITHER PLT REMEMBERS ANY UNUSUAL EAR PRESSURE RELEASE DUE TO CLB, BUT THAT MAY BE DUE TO DISTR OF TROUBLESHOOTING THIRD ALTIMETER, WHICH HAD BEEN GROSSLY 'HANGING UP' AND LAGGING BY AS MUCH AS 1000 FT (VIBRATOR CB HAD POPPED). CABIN PRESSURIZED AND FLT CONTINUED.

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.