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Air carrier assigned altitude, then given speed restriction. Confusion by controller if crew acknowledged FL280. Speed restriction was 280 KTS.
| Attributes | |
| ACN | 201011 |
| Time | |
| Date | 199202 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : rka |
| State Reference | NY |
| Altitude | msl bound lower : 28000 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | climbout : intermediate altitude cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 150 flight time total : 3000 flight time type : 200 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 200 flight time total : 6000 flight time type : 1820 |
| ASRS Report | 200818 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
Air carrier X was cleared to FL290. As we were climbing the controller asked another flight his airspeed. The pilot responded and the controller asked him to increase to 310 KTS. The controller then asked air carrier X to maintain 280 or two eight zero but I didn't hear flight level in the call. I set our performance computer for 280 KTS and the captain began to slow the airplane. As we were leveling at FL290 we received a TCASII TA. ATC then called out the traffic and we confirmed traffic in sight. A few moments after the traffic had passed, the controller asked us if we had read back a clearance to maintain FL280. We said no, that we were maintaining 280 KTS. The controller then told us to maintain FL290 and normal speed. Supplemental information from acn 200818. The controller, after assigning FL290 to air carrier X assigned an airspeed of 310 to an air carrier Y, then 280 KTS to air carrier X. Later thought he had assigned FL280 to air carrier X the controller never said 'FL280' until he asked if we acknowledged clearance to 'FL280' and we said no. All parties should use proper ATC phraseology to avoid confusion.
Original NASA ASRS Text
Title: ACR ASSIGNED ALT, THEN GIVEN SPD RESTRICTION. CONFUSION BY CTLR IF CREW ACKNOWLEDGED FL280. SPD RESTRICTION WAS 280 KTS.
Narrative: ACR X WAS CLRED TO FL290. AS WE WERE CLBING THE CTLR ASKED ANOTHER FLT HIS AIRSPD. THE PLT RESPONDED AND THE CTLR ASKED HIM TO INCREASE TO 310 KTS. THE CTLR THEN ASKED ACR X TO MAINTAIN 280 OR TWO EIGHT ZERO BUT I DIDN'T HEAR FLT LEVEL IN THE CALL. I SET OUR PERFORMANCE COMPUTER FOR 280 KTS AND THE CAPT BEGAN TO SLOW THE AIRPLANE. AS WE WERE LEVELING AT FL290 WE RECEIVED A TCASII TA. ATC THEN CALLED OUT THE TFC AND WE CONFIRMED TFC IN SIGHT. A FEW MOMENTS AFTER THE TFC HAD PASSED, THE CTLR ASKED US IF WE HAD READ BACK A CLRNC TO MAINTAIN FL280. WE SAID NO, THAT WE WERE MAINTAINING 280 KTS. THE CTLR THEN TOLD US TO MAINTAIN FL290 AND NORMAL SPD. SUPPLEMENTAL INFO FROM ACN 200818. THE CTLR, AFTER ASSIGNING FL290 TO ACR X ASSIGNED AN AIRSPD OF 310 TO AN ACR Y, THEN 280 KTS TO ACR X. LATER THOUGHT HE HAD ASSIGNED FL280 TO ACR X THE CTLR NEVER SAID 'FL280' UNTIL HE ASKED IF WE ACKNOWLEDGED CLRNC TO 'FL280' AND WE SAID NO. ALL PARTIES SHOULD USE PROPER ATC PHRASEOLOGY TO AVOID CONFUSION.
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.