Light transport charter aircraft on climb, unable to communication on new departure control frequency, went back to previous controller who assigned a different altitude. Reporter captain states that controllers should limit clearance to heading and altitude in 1 transmission, then frequency changes afterward to prevent number mix-up.

Home

Browse by month

Random

Latest

About

Contact

Attributes
ACN	381930
Time
Date	199710
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	msl bound lower : 3000 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord
Operator	general aviation : instructional
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 5500 flight time type : 100
ASRS Report	381930
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

ATC assigned a 360 degree heading and a climb to 6000 ft MSL along with a new frequency for departure control. We turned left to 360 degrees and started a climb to 6000 ft MSL. When we changed to the new assigned frequency we got no reply. We then changed back to our previous frequency and told the controller we did not get a reply. He then asked our altitude and I advised we were out of 4500 ft MSL for 6000 ft MSL assigned. He told us to maintain 5000 ft MSL. I believe if the controllers will state heading and altitude assignments only in 1 transmission and frequency changes in a second transmission, the controllers will not assign altitude changes or heading changes in error and the pilots will not misunderstand what the controller is assigning.

Original NASA ASRS Text

Title: LTT CHARTER ACFT ON CLB, UNABLE TO COM ON NEW DEP CTL FREQ, WENT BACK TO PREVIOUS CTLR WHO ASSIGNED A DIFFERENT ALT. RPTR CAPT STATES THAT CTLRS SHOULD LIMIT CLRNC TO HDG AND ALT IN 1 XMISSION, THEN FREQ CHANGES AFTERWARD TO PREVENT NUMBER MIX-UP.

Narrative: ATC ASSIGNED A 360 DEG HDG AND A CLB TO 6000 FT MSL ALONG WITH A NEW FREQ FOR DEP CTL. WE TURNED L TO 360 DEGS AND STARTED A CLB TO 6000 FT MSL. WHEN WE CHANGED TO THE NEW ASSIGNED FREQ WE GOT NO REPLY. WE THEN CHANGED BACK TO OUR PREVIOUS FREQ AND TOLD THE CTLR WE DID NOT GET A REPLY. HE THEN ASKED OUR ALT AND I ADVISED WE WERE OUT OF 4500 FT MSL FOR 6000 FT MSL ASSIGNED. HE TOLD US TO MAINTAIN 5000 FT MSL. I BELIEVE IF THE CTLRS WILL STATE HDG AND ALT ASSIGNMENTS ONLY IN 1 XMISSION AND FREQ CHANGES IN A SECOND XMISSION, THE CTLRS WILL NOT ASSIGN ALT CHANGES OR HDG CHANGES IN ERROR AND THE PLTS WILL NOT MISUNDERSTAND WHAT THE CTLR IS ASSIGNING.

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.