A B737-500 in cruise at FL350 diverted due to loss of pressurization but made no logbook entry on pr...

Attributes
ACN	508671
Time
Date	200104
Day	Tue
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	msl single value : 35000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla.artcc
Operator	common carrier : air carrier
Make Model Name	B737-500
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 255 flight time total : 14000 flight time type : 9500
ASRS Report	508671
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : less severe non adherence : far non adherence : published procedure other anomaly other
Independent Detector	other other : 936
Consequence	other other
Supplementary
Problem Areas	Environmental Factor Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance

Narrative:

En route from phx to oak at approximately 50 NM northeast of lax at FL350, the cabin pressurization horn began to sound. The cabin had reached 10500 ft and climbing at 400-500 FPM. I asked for an immediate descent, called for the checklist. We ran the checklist to no avail. I spoke with dispatch, lax maintenance, lax operations, set up for a divert to lax. Descending through FL180, the cabin stabilized and started to descend. Reaching 12000 ft, we had a normal approach and landing in lax. I left the aircraft without filling out the logbook. The next day the chief pilot informed me that I had forgot to make an entry in the logbook.

Original NASA ASRS Text

Title: A B737-500 IN CRUISE AT FL350 DIVERTED DUE TO LOSS OF PRESSURIZATION BUT MADE NO LOGBOOK ENTRY ON PRESSURIZATION FAILURE.

Narrative: ENRTE FROM PHX TO OAK AT APPROX 50 NM NE OF LAX AT FL350, THE CABIN PRESSURIZATION HORN BEGAN TO SOUND. THE CABIN HAD REACHED 10500 FT AND CLBING AT 400-500 FPM. I ASKED FOR AN IMMEDIATE DSCNT, CALLED FOR THE CHKLIST. WE RAN THE CHKLIST TO NO AVAIL. I SPOKE WITH DISPATCH, LAX MAINT, LAX OPS, SET UP FOR A DIVERT TO LAX. DSNDING THROUGH FL180, THE CABIN STABILIZED AND STARTED TO DSND. REACHING 12000 FT, WE HAD A NORMAL APCH AND LNDG IN LAX. I LEFT THE ACFT WITHOUT FILLING OUT THE LOGBOOK. THE NEXT DAY THE CHIEF PLT INFORMED ME THAT I HAD FORGOT TO MAKE AN ENTRY IN THE LOGBOOK.

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.

A B737-500 in cruise at FL350 diverted due to loss of pressurization but made no logbook entry on pressurization failure.