<< >> NASA ASRS Report 313403, August 1995

A clearance for a SID altitude crossing restr was overshot. ATC questioned air carrier flight crew clearance.

Attributes
ACN	313403
Time
Date	199508
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sjc
State Reference	CA
Altitude	msl bound lower : 12000 msl bound upper : 13100
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Controlling Facilities	artcc : sjc tower : dca
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	departure other departure sid : sid enroute : direct enroute airway : zoa
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 15500
ASRS Report	313403
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 110 flight time total : 13500 flight time type : 6500
ASRS Report	313220
Events
Anomaly	altitude deviation : crossing restriction not met altitude deviation : overshoot non adherence : clearance non adherence : published procedure non adherence other
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During SID, tower deleted 5000 ft restr to climb and cleared us to FL230. I heard 'cross sjc VOR at or above 12000 ft, maintain FL230. First officer thinks he heard cross VOR at 12000 ft, maintain FL230. We crossed sjc VOR climbing through 13000 ft. Oakland questioned whether departure had deleted altitude restrs. I told them what I had heard. Supplemental information from acn 313220: early morning departure from sjc. Cleared via loop 9 departure (overly complicated with several altitude restrs). Controller cleared us to turn to sjc VOR fly published SID climb to FL230 and I thought I heard cross sjc at 12000 ft. FL230 was set in altitude window. While performing collateral duties I looked and saw we were climbing through 13100 ft just prior to crossing sjc. I questioned the 12000 ft restr to captain who said he heard sjc at or above 12000 ft. When 2 altitude clrncs are received it would probably be best to put the most restrictive in the altitude window. This is my company's SOP, but in the confused clearance the 'cleared to' altitude was set. No traffic conflict resulted.

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Original NASA ASRS Text

Title: A CLRNC FOR A SID ALT XING RESTR WAS OVERSHOT. ATC QUESTIONED ACR FLC CLRNC.

Narrative: DURING SID, TWR DELETED 5000 FT RESTR TO CLB AND CLRED US TO FL230. I HEARD 'CROSS SJC VOR AT OR ABOVE 12000 FT, MAINTAIN FL230. FO THINKS HE HEARD CROSS VOR AT 12000 FT, MAINTAIN FL230. WE CROSSED SJC VOR CLBING THROUGH 13000 FT. OAKLAND QUESTIONED WHETHER DEP HAD DELETED ALT RESTRS. I TOLD THEM WHAT I HAD HEARD. SUPPLEMENTAL INFO FROM ACN 313220: EARLY MORNING DEP FROM SJC. CLRED VIA LOOP 9 DEP (OVERLY COMPLICATED WITH SEVERAL ALT RESTRS). CTLR CLRED US TO TURN TO SJC VOR FLY PUBLISHED SID CLB TO FL230 AND I THOUGHT I HEARD CROSS SJC AT 12000 FT. FL230 WAS SET IN ALT WINDOW. WHILE PERFORMING COLLATERAL DUTIES I LOOKED AND SAW WE WERE CLBING THROUGH 13100 FT JUST PRIOR TO XING SJC. I QUESTIONED THE 12000 FT RESTR TO CAPT WHO SAID HE HEARD SJC AT OR ABOVE 12000 FT. WHEN 2 ALT CLRNCS ARE RECEIVED IT WOULD PROBABLY BE BEST TO PUT THE MOST RESTRICTIVE IN THE ALT WINDOW. THIS IS MY COMPANY'S SOP, BUT IN THE CONFUSED CLRNC THE 'CLRED TO' ALT WAS SET. NO TFC CONFLICT RESULTED.

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.