Altitude deviation altitude excursion -- publication deficiency -- this air carrier captain left his assigned altitude early. He complains that the SID is overly complicated and confusing.

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Attributes
ACN	321776
Time
Date	199511
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : slc
State Reference	UT
Altitude	msl bound lower : 12700 msl bound upper : 13000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : slc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 180 flight time total : 12000 flight time type : 10000
ASRS Report	321776
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : far non adherence : published procedure non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

I descended out of 13000 ft on the jammn 1, 2 mi prior to spiek and I can't tell you why. It was only a 300 ft deviation in VMC so it was not dangerous, but it was still stupid. The first officer was off talking to the company. The jammn 1 SID plate is very busy, mixes 'expect' and 'cross' altitudes and has 2 'maintain' altitudes on the south flow.

Original NASA ASRS Text

Title: ALTDEV ALT EXCURSION -- PUB DEFICIENCY -- THIS ACR CAPT LEFT HIS ASSIGNED ALT EARLY. HE COMPLAINS THAT THE SID IS OVERLY COMPLICATED AND CONFUSING.

Narrative: I DSNDED OUT OF 13000 FT ON THE JAMMN 1, 2 MI PRIOR TO SPIEK AND I CAN'T TELL YOU WHY. IT WAS ONLY A 300 FT DEV IN VMC SO IT WAS NOT DANGEROUS, BUT IT WAS STILL STUPID. THE FO WAS OFF TALKING TO THE COMPANY. THE JAMMN 1 SID PLATE IS VERY BUSY, MIXES 'EXPECT' AND 'CROSS' ALTS AND HAS 2 'MAINTAIN' ALTS ON THE S FLOW.

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.