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Small aircraft on night IMC in mountainous terrain. Flies into embedded thunderstorm and up down drafts. Given block altitude and right turn deviation.
| Attributes | |
| ACN | 210045 |
| Time | |
| Date | 199205 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : llc |
| State Reference | NV |
| Altitude | msl bound lower : 12000 msl bound upper : 13000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, Low Wing, 1 Eng, Retractable Gear |
| Flight Phase | cruise other |
| Route In Use | enroute airway : zlc |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : cfi pilot : commercial |
| Experience | flight time last 90 days : 48 flight time total : 2000 flight time type : 48 |
| ASRS Report | 210045 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Night IFR, flew into edge of embedded thunderstorm lightning cloud to cloud, cloud to ground with up and down drafts 800- 1000 FPM. First indication lightning altitude went from 12000 to 13000 in less than 15 seconds. No WX reports at bam no altimeter available at wmc. Requested a 30 degree right of course deviation and received 12000-14000 altitude block. Aircraft marginal performance at 12000. Spotty WX reports over the route. Lack of pilot reports over route. Center and WX radar not available or not capable of painting circuit breaker activity due to traffic separation requirements. Single engine night IFR in mountain areas with lack of WX reporting and WX radar make full utilization of aircraft and national airspace system extremely marginal. Aircraft performance is marginal at altitude with mountain wave and up and down drafts easily exceeding aircraft performance.
Original NASA ASRS Text
Title: SMA ON NIGHT IMC IN MOUNTAINOUS TERRAIN. FLIES INTO EMBEDDED TSTM AND UP DOWN DRAFTS. GIVEN BLOCK ALT AND R TURN DEV.
Narrative: NIGHT IFR, FLEW INTO EDGE OF EMBEDDED TSTM LIGHTNING CLOUD TO CLOUD, CLOUD TO GND WITH UP AND DOWN DRAFTS 800- 1000 FPM. FIRST INDICATION LIGHTNING ALT WENT FROM 12000 TO 13000 IN LESS THAN 15 SECONDS. NO WX RPTS AT BAM NO ALTIMETER AVAILABLE AT WMC. REQUESTED A 30 DEG R OF COURSE DEV AND RECEIVED 12000-14000 ALT BLOCK. ACFT MARGINAL PERFORMANCE AT 12000. SPOTTY WX RPTS OVER THE RTE. LACK OF PLT RPTS OVER RTE. CTR AND WX RADAR NOT AVAILABLE OR NOT CAPABLE OF PAINTING CB ACTIVITY DUE TO TFC SEPARATION REQUIREMENTS. SINGLE ENG NIGHT IFR IN MOUNTAIN AREAS WITH LACK OF WX RPTING AND WX RADAR MAKE FULL UTILIZATION OF ACFT AND NATIONAL AIRSPACE SYS EXTREMELY MARGINAL. ACFT PERFORMANCE IS MARGINAL AT ALT WITH MOUNTAIN WAVE AND UP AND DOWN DRAFTS EASILY EXCEEDING ACFT PERFORMANCE.
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.