Air carrier medium large transport altitude deviation overshot during big sur profile descent into s...

Attributes
ACN	148065
Time
Date	199006
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : oak airport : sfo
State Reference	CA
Altitude	msl bound lower : 13000 msl bound upper : 16000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zoa tower : lns
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other descent other
Route In Use	arrival : profile descent
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 6500 flight time type : 500
ASRS Report	148065
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude altitude deviation : overshoot non adherence : published procedure non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During the descent oak cleared us to fly a heading to intercept the oak 151 degree right, intercept at or above 16000'. Cleared the profile descent, cross skunk at 250 KTS. I then went off frequency to call ATIS, company, and give the final PA to the passengers. During the PA announcement the captain asked me about the clearance. I thought we were between anjee and skunk, so my reply was cross skunk between 10000' and 12000' at 250 KTS. About 5 mi later oak asked our DME from oak. By the time we could respond we were at 55 DME and 13500'. Oak stated that we were supposed to have xed anjee at or above 16000'. Oak made no further comment. The captain stated he thought that oak had cleared us to intercept at or above 16000' and then down to cross skunk between 10000' and 12000' at 250 KTS. Due to myself being off the radio with other cockpit duties my attention was diverted from monitoring the clearance. I have almost had this happen before because the way the clearance is given is very confusing and it is a very busy time in a two man cockpit.

Original NASA ASRS Text

Title: ACR MLG ALT DEVIATION OVERSHOT DURING BIG SUR PROFILE DESCENT INTO SFO.

Narrative: DURING THE DSNT OAK CLRED US TO FLY A HDG TO INTERCEPT THE OAK 151 DEG R, INTERCEPT AT OR ABOVE 16000'. CLRED THE PROFILE DSNT, CROSS SKUNK AT 250 KTS. I THEN WENT OFF FREQ TO CALL ATIS, COMPANY, AND GIVE THE FINAL PA TO THE PAXS. DURING THE PA ANNOUNCEMENT THE CAPT ASKED ME ABOUT THE CLRNC. I THOUGHT WE WERE BTWN ANJEE AND SKUNK, SO MY REPLY WAS CROSS SKUNK BTWN 10000' AND 12000' AT 250 KTS. ABOUT 5 MI LATER OAK ASKED OUR DME FROM OAK. BY THE TIME WE COULD RESPOND WE WERE AT 55 DME AND 13500'. OAK STATED THAT WE WERE SUPPOSED TO HAVE XED ANJEE AT OR ABOVE 16000'. OAK MADE NO FURTHER COMMENT. THE CAPT STATED HE THOUGHT THAT OAK HAD CLRED US TO INTERCEPT AT OR ABOVE 16000' AND THEN DOWN TO CROSS SKUNK BTWN 10000' AND 12000' AT 250 KTS. DUE TO MYSELF BEING OFF THE RADIO WITH OTHER COCKPIT DUTIES MY ATTN WAS DIVERTED FROM MONITORING THE CLRNC. I HAVE ALMOST HAD THIS HAPPEN BEFORE BECAUSE THE WAY THE CLRNC IS GIVEN IS VERY CONFUSING AND IT IS A VERY BUSY TIME IN A TWO MAN COCKPIT.

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.

Air carrier medium large transport altitude deviation overshot during big sur profile descent into sfo.