<< >> NASA ASRS Report 143314, April 1990

Altitude bust.

Attributes
ACN	143314
Time
Date	199004
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zdc
State Reference	DC
Altitude	msl bound lower : 28000 msl bound upper : 28300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc tower : oak
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute airway : zdc
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 7000 flight time type : 500
ASRS Report	143314
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 270 flight time total : 4000 flight time type : 500
ASRS Report	143311
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	Pilot Deviation other

Narrative:

During a speed controled stop climb with several speeds of 280 KTS, 290 KTS and altitude changes of FL270, FL280 and FL290, confusion over our cleared altitude occurred. Similar clrncs for other aircraft going the same direction were being given. We were in doubt of whether we were cleared to FL280 or FL290. We questioned center, but it was difficult working into the frequency. As a precaution we disengaged the autoplt at FL280, but the aircraft continued to climb to FL283 before leveling at FL280. The controller confirmed our clearance was FL280. There was no conflict of traffic or any remarks from the controller.

Related reports:

• DC9 crew undershot an altitude crossing restr.
• A C172 instructor and student descended prematurely at kism,...
• Cpr small transport altitude deviation excursion from cleara...
• An air carrier flight crew responded to a vector clearance w...
• MD80 had altitude excursion.
• While level at intermediate altitude crew received a climb R...

	Enter your search terms Submit search form
	Web www.37000feet.com

Original NASA ASRS Text

Title: ALT BUST.

Narrative: DURING A SPD CTLED STOP CLB WITH SEVERAL SPDS OF 280 KTS, 290 KTS AND ALT CHANGES OF FL270, FL280 AND FL290, CONFUSION OVER OUR CLRED ALT OCCURRED. SIMILAR CLRNCS FOR OTHER ACFT GOING THE SAME DIRECTION WERE BEING GIVEN. WE WERE IN DOUBT OF WHETHER WE WERE CLRED TO FL280 OR FL290. WE QUESTIONED CENTER, BUT IT WAS DIFFICULT WORKING INTO THE FREQ. AS A PRECAUTION WE DISENGAGED THE AUTOPLT AT FL280, BUT THE ACFT CONTINUED TO CLB TO FL283 BEFORE LEVELING AT FL280. THE CTLR CONFIRMED OUR CLRNC WAS FL280. THERE WAS NO CONFLICT OF TFC OR ANY REMARKS FROM THE CTLR.

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.