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Mountain wave encounter creates loss of separation and a potential conflict between a PC12 atx pilot and aircraft in a holding pattern 4 NM from pih, identification.
| Attributes | |
| ACN | 545302 |
| Time | |
| Date | 200204 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : pih.vortac |
| State Reference | ID |
| Altitude | msl single value : 9000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Ice Windshear Turbulence Snow |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : s56.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | PC-12 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : s46.tracon |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise : holding |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : private pilot : multi engine pilot : student pilot : atp pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 60 flight time total : 4800 flight time type : 390 |
| ASRS Report | 545302 |
| Person 2 | |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : turbulence inflight encounter : weather inflight encounter other non adherence : clearance non adherence : required legal separation other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : regained aircraft control flight crew : returned to assigned altitude |
| Miss Distance | horizontal : 24000 vertical : 300 |
| Supplementary | |
| Problem Areas | Aircraft Weather Flight Crew Human Performance Environmental Factor |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation |
Narrative:
ATC cleared me to slc. I estimated takeoff in 2 mins. I was delayed by 5 mins. ATC had 1 aircraft holding, 1 inbound. I was cleared to climb and maintain 9000 ft. Turbulence and windshear made it impossible to maintain 9000 ft. I went as high as 9700 ft. As safe as I could, I nosed the plane over to descend to 9000 ft. Due to the close proximity of the other aircraft, ATC lost separation with that aircraft. At 8000 ft, the autoplt was disengaged because of rapid rate of climb. Power was pulled to flight idle and around 15 degrees pitch down through 8500 ft. Possible mountain wave of heavy updrafts were present. WX and a rapid rate of climb were the causes, also the controller putting 2 or 3 aircraft in close proximity of each other without acknowledging or making me aware of the other aircraft's position and altitude.
Original NASA ASRS Text
Title: MOUNTAIN WAVE ENCOUNTER CREATES LOSS OF SEPARATION AND A POTENTIAL CONFLICT BTWN A PC12 ATX PLT AND ACFT IN A HOLDING PATTERN 4 NM FROM PIH, ID.
Narrative: ATC CLRED ME TO SLC. I ESTIMATED TKOF IN 2 MINS. I WAS DELAYED BY 5 MINS. ATC HAD 1 ACFT HOLDING, 1 INBOUND. I WAS CLRED TO CLB AND MAINTAIN 9000 FT. TURB AND WINDSHEAR MADE IT IMPOSSIBLE TO MAINTAIN 9000 FT. I WENT AS HIGH AS 9700 FT. AS SAFE AS I COULD, I NOSED THE PLANE OVER TO DSND TO 9000 FT. DUE TO THE CLOSE PROX OF THE OTHER ACFT, ATC LOST SEPARATION WITH THAT ACFT. AT 8000 FT, THE AUTOPLT WAS DISENGAGED BECAUSE OF RAPID RATE OF CLB. PWR WAS PULLED TO FLT IDLE AND AROUND 15 DEGS PITCH DOWN THROUGH 8500 FT. POSSIBLE MOUNTAIN WAVE OF HVY UPDRAFTS WERE PRESENT. WX AND A RAPID RATE OF CLB WERE THE CAUSES, ALSO THE CTLR PUTTING 2 OR 3 ACFT IN CLOSE PROX OF EACH OTHER WITHOUT ACKNOWLEDGING OR MAKING ME AWARE OF THE OTHER ACFT'S POS AND ALT.
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.