Air carrier large transport pressurization problem during climb out from bos. Return land.

Attributes
ACN	194563
Time
Date	199111
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bos
State Reference	MA
Altitude	agl bound lower : 0 agl bound upper : 10000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bos tower : sfo
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	climbout : initial climbout : intermediate altitude climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 4000 flight time type : 450
ASRS Report	194563
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : private pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 134 flight time total : 9300 flight time type : 4750
ASRS Report	194866
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable other
Consequence	other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

I was flying the aircraft when the incident occurred. At liftoff the aircraft experienced an over pressurization. While the captain and so handled the situation, I flew the airplane. We did not go above 10000 ft. We returned to boston flying an ILS to runway 4R. 4 passenger received treatment from paramedics when we blocked in. Supplemental information from acn 194866: shortly after the positive rate callout, my ears started popping. I looked at the so's panel and noticed the cabin rate of change indicator was pegged at 2000 FPM of descent. The automatic fail light and standby light were on. Cabin altitude was 5000 ft, and cabin psid was 9.3 psid. The so switched to manual dc. We still were unable to control the cabin pressurization.

Original NASA ASRS Text

Title: ACR LGT PRESSURIZATION PROBLEM DURING CLB OUT FROM BOS. RETURN LAND.

Narrative: I WAS FLYING THE ACFT WHEN THE INCIDENT OCCURRED. AT LIFTOFF THE ACFT EXPERIENCED AN OVER PRESSURIZATION. WHILE THE CAPT AND SO HANDLED THE SITUATION, I FLEW THE AIRPLANE. WE DID NOT GO ABOVE 10000 FT. WE RETURNED TO BOSTON FLYING AN ILS TO RWY 4R. 4 PAX RECEIVED TREATMENT FROM PARAMEDICS WHEN WE BLOCKED IN. SUPPLEMENTAL INFO FROM ACN 194866: SHORTLY AFTER THE POSITIVE RATE CALLOUT, MY EARS STARTED POPPING. I LOOKED AT THE SO'S PANEL AND NOTICED THE CABIN RATE OF CHANGE INDICATOR WAS PEGGED AT 2000 FPM OF DSCNT. THE AUTO FAIL LIGHT AND STANDBY LIGHT WERE ON. CABIN ALT WAS 5000 FT, AND CABIN PSID WAS 9.3 PSID. THE SO SWITCHED TO MANUAL DC. WE STILL WERE UNABLE TO CTL THE CABIN PRESSURIZATION.

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.