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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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While executing a STAR during moderate traffic conditions, an HS25 was issued additional STAR altitude crossing changes that were incorrectly transposed into their VNAV FMS. ATC challenged their altitude when level, issuing a 90 degree turn from descending conflicting traffic. ATC apparently did not catch flight crew incorrect altitude readback.
| Attributes | |
| ACN | 388719 |
| Time | |
| Date | 199712 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ard |
| State Reference | PA |
| Altitude | msl bound lower : 11000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | general aviation : corporate |
| Make Model Name | BAe 125 Series 800 |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Route In Use | arrival star : star |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 85 flight time total : 7000 flight time type : 1700 |
| ASRS Report | 388719 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | controller military : 3 flight time last 90 days : 100 flight time total : 11000 flight time type : 700 |
| ASRS Report | 388723 |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : clearance |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance flight crew : returned to intended course or assigned course none taken : insufficient time |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 9000 vertical : 1000 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Normal operations on IFR flight pdk direct teb. I had programmed the VNAV to cross kerno intersection at FL260 per the STAR. ATC then issued a clearance to cross swann intersection at FL260 (1 fix early). I reprogrammed the box for swann intersection at FL260. The next clearance was to cross 15 NM south of dqo VOR at 11000 ft. Before we could question the clearance he corrected himself to make the crossing restr at yardly VOR. I programmed the VNAV and the first officer set the altitude alert and I verified that he set 11000 ft. We had been level at 11000 ft for about 30 seconds when ATC questioned our altitude. We reaffirmed 11000 ft per our clearance. An immediate 90 degree left turn was requested and executed. While in the turn the traffic was pointed out and seen. ATC gave us a phone number to call. The number was dialed and a short discussion was had. The first problem was that ATC issued clrncs (crossing restr) that were contrary to the STAR. This increased cockpit workload. This flight department policy for altitude change is that the PNF receives the clearance and sets the altitude alerter. He must receive acknowledgment from the PF before removing his hand from the altitude alerter. Both pilots are rated with over 1000 hours in make and model. This was very disturbing. It would be nice to be able to hear the tape especially if we could learn the how or when the miscom occurred.
Original NASA ASRS Text
Title: WHILE EXECUTING A STAR DURING MODERATE TFC CONDITIONS, AN HS25 WAS ISSUED ADDITIONAL STAR ALT XING CHANGES THAT WERE INCORRECTLY TRANSPOSED INTO THEIR VNAV FMS. ATC CHALLENGED THEIR ALT WHEN LEVEL, ISSUING A 90 DEG TURN FROM DSNDING CONFLICTING TFC. ATC APPARENTLY DID NOT CATCH FLC INCORRECT ALT READBACK.
Narrative: NORMAL OPS ON IFR FLT PDK DIRECT TEB. I HAD PROGRAMMED THE VNAV TO CROSS KERNO INTXN AT FL260 PER THE STAR. ATC THEN ISSUED A CLRNC TO CROSS SWANN INTXN AT FL260 (1 FIX EARLY). I REPROGRAMMED THE BOX FOR SWANN INTXN AT FL260. THE NEXT CLRNC WAS TO CROSS 15 NM S OF DQO VOR AT 11000 FT. BEFORE WE COULD QUESTION THE CLRNC HE CORRECTED HIMSELF TO MAKE THE XING RESTR AT YARDLY VOR. I PROGRAMMED THE VNAV AND THE FO SET THE ALT ALERT AND I VERIFIED THAT HE SET 11000 FT. WE HAD BEEN LEVEL AT 11000 FT FOR ABOUT 30 SECONDS WHEN ATC QUESTIONED OUR ALT. WE REAFFIRMED 11000 FT PER OUR CLRNC. AN IMMEDIATE 90 DEG L TURN WAS REQUESTED AND EXECUTED. WHILE IN THE TURN THE TFC WAS POINTED OUT AND SEEN. ATC GAVE US A PHONE NUMBER TO CALL. THE NUMBER WAS DIALED AND A SHORT DISCUSSION WAS HAD. THE FIRST PROB WAS THAT ATC ISSUED CLRNCS (XING RESTR) THAT WERE CONTRARY TO THE STAR. THIS INCREASED COCKPIT WORKLOAD. THIS FLT DEPT POLICY FOR ALT CHANGE IS THAT THE PNF RECEIVES THE CLRNC AND SETS THE ALT ALERTER. HE MUST RECEIVE ACKNOWLEDGMENT FROM THE PF BEFORE REMOVING HIS HAND FROM THE ALT ALERTER. BOTH PLTS ARE RATED WITH OVER 1000 HRS IN MAKE AND MODEL. THIS WAS VERY DISTURBING. IT WOULD BE NICE TO BE ABLE TO HEAR THE TAPE ESPECIALLY IF WE COULD LEARN THE HOW OR WHEN THE MISCOM OCCURRED.
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.