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ARTCC controller requested expedited climb. Flight crew of medium large transport complied. Trading airspeed for increased rate of climb. Controller protested reduced speed.
| Attributes | |
| ACN | 113049 |
| Time | |
| Date | 198906 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : den |
| State Reference | CO |
| Altitude | msl bound lower : 21000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv |
| 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 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 180 flight time total : 16000 flight time type : 280 |
| ASRS Report | 113049 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | other anomaly other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
We were on radar vectors out of denver, with an interim altitude clearance to FL230. At approximately FL210 ATC issued an expedited climb through FL260 with clearance to FL330. We were on a speed clearance of normal climb speed (280 KTS). In order to accommodate the most current ATC request we increased rate of climb and the airspeed deteriorated to 235 KTS, at FL250. At that time the controller on 132.22, became quite vexed with our airspeed loss. This letter is in lieu of an extended conversation with him on the radio. I was left with the disturbing impression that the controller is unaware all commercial turbojet aircraft have a maximum climb thrust which is set for the duration of any climb, the normal climb speed that is established takes this into consideration. The only energy available for an expedited climb, unequivocally has to come out of airspeed.
Original NASA ASRS Text
Title: ARTCC CTLR REQUESTED EXPEDITED CLIMB. FLT CREW OF MLG COMPLIED. TRADING AIRSPEED FOR INCREASED RATE OF CLIMB. CTLR PROTESTED REDUCED SPEED.
Narrative: WE WERE ON RADAR VECTORS OUT OF DENVER, WITH AN INTERIM ALT CLRNC TO FL230. AT APPROX FL210 ATC ISSUED AN EXPEDITED CLIMB THROUGH FL260 WITH CLRNC TO FL330. WE WERE ON A SPEED CLRNC OF NORMAL CLIMB SPEED (280 KTS). IN ORDER TO ACCOMMODATE THE MOST CURRENT ATC REQUEST WE INCREASED RATE OF CLIMB AND THE AIRSPEED DETERIORATED TO 235 KTS, AT FL250. AT THAT TIME THE CTLR ON 132.22, BECAME QUITE VEXED WITH OUR AIRSPEED LOSS. THIS LETTER IS IN LIEU OF AN EXTENDED CONVERSATION WITH HIM ON THE RADIO. I WAS LEFT WITH THE DISTURBING IMPRESSION THAT THE CTLR IS UNAWARE ALL COMMERCIAL TURBOJET ACFT HAVE A MAX CLIMB THRUST WHICH IS SET FOR THE DURATION OF ANY CLIMB, THE NORMAL CLIMB SPEED THAT IS ESTABLISHED TAKES THIS INTO CONSIDERATION. THE ONLY ENERGY AVAILABLE FOR AN EXPEDITED CLIMB, UNEQUIVOCALLY HAS TO COME OUT OF AIRSPEED.
Data retrieved from NASA's ASRS site as of August 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.