On takeoff pressurization spikes excessively. Automatic control deactivated.

Attributes
ACN	277806
Time
Date	199407
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : fll
State Reference	FL
Altitude	msl bound lower : 1500 msl bound upper : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mia
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 220 flight time total : 8000 flight time type : 3000
ASRS Report	277806
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	controller : issued new clearance flight crew : overcame equipment problem other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Immediately after takeoff, cabin pressurization spiked at an excessive rate. The cabin rate of descent was such that immediate action was required to alleviate discomfort, pain and possible injury. While the first officer went through the after takeoff checklist and changed from tower to departure control, I flew the aircraft and tried to correct the cabin pressure problem with the manual control. During this the flight attendant call light illuminated, which served as another distraction. Throughout this I had maintained runway heading 090 degrees however clearance was 110 degrees after takeoff. Departure control questioned this after instructing us to turn to 120 degrees. I explained that we became preoccupied with the pressurization problem and missed the turn. During the turn to 120 degrees we received a momentary RA on TCASII with traffic that departed runway 9L. The flight continued without further incident with pressurization deactivated.

Original NASA ASRS Text

Title: ON TKOF PRESSURIZATION SPIKES EXCESSIVELY. AUTO CTL DEACTIVATED.

Narrative: IMMEDIATELY AFTER TKOF, CABIN PRESSURIZATION SPIKED AT AN EXCESSIVE RATE. THE CABIN RATE OF DSCNT WAS SUCH THAT IMMEDIATE ACTION WAS REQUIRED TO ALLEVIATE DISCOMFORT, PAIN AND POSSIBLE INJURY. WHILE THE FO WENT THROUGH THE AFTER TKOF CHKLIST AND CHANGED FROM TWR TO DEP CTL, I FLEW THE ACFT AND TRIED TO CORRECT THE CABIN PRESSURE PROB WITH THE MANUAL CTL. DURING THIS THE FLT ATTENDANT CALL LIGHT ILLUMINATED, WHICH SERVED AS ANOTHER DISTR. THROUGHOUT THIS I HAD MAINTAINED RWY HDG 090 DEGS HOWEVER CLRNC WAS 110 DEGS AFTER TKOF. DEP CTL QUESTIONED THIS AFTER INSTRUCTING US TO TURN TO 120 DEGS. I EXPLAINED THAT WE BECAME PREOCCUPIED WITH THE PRESSURIZATION PROB AND MISSED THE TURN. DURING THE TURN TO 120 DEGS WE RECEIVED A MOMENTARY RA ON TCASII WITH TFC THAT DEPARTED RWY 9L. THE FLT CONTINUED WITHOUT FURTHER INCIDENT WITH PRESSURIZATION DEACTIVATED.

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.