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An IFR C172 was unable to maintain 11;500 ft MSL due to mountain waves over southern california mountains and after asking for ATC assistance to clear terrain were advised to call because of an IFR routing deviation.
| Attributes | |
| ACN | 1093766 |
| Time | |
| Date | 201306 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | SCT.TRACON |
| State Reference | CA |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Other 141 |
| Flight Phase | Cruise |
| Route In Use | Airway V283-587 STAR KAYOH |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Instructor Pilot Flying |
| Qualification | Flight Crew Flight Instructor Flight Crew Commercial |
| Experience | Flight Crew Total 800 |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Inflight Event / Encounter CFTT / CFIT Inflight Event / Encounter Weather / Turbulence |
Narrative:
IFR flight. Encountered smooth but severe downdrafts. Advised ATC that we could not maintain altitude and was dropping below MEA for the arrival. They helped/vectored us around the mountain to clear terrain. We went from 11;500 ft MSL to below 10;500 ft MSL with a 200-700 FPM descent while we had full power and vx climb pitch and speed (65 KIAS) with clean configuration. ATC advised us to call to talk with them because we deviated from IFR routing.
Original NASA ASRS Text
Title: An IFR C172 was unable to maintain 11;500 FT MSL due to mountain waves over Southern California mountains and after asking for ATC assistance to clear terrain were advised to call because of an IFR routing deviation.
Narrative: IFR flight. Encountered smooth but severe downdrafts. Advised ATC that we could not maintain altitude and was dropping below MEA for the arrival. They helped/vectored us around the mountain to clear terrain. We went from 11;500 FT MSL to below 10;500 FT MSL with a 200-700 FPM descent while we had full power and Vx climb pitch and speed (65 KIAS) with clean configuration. ATC advised us to call to talk with them because we deviated from IFR routing.
Data retrieved from NASA's ASRS site as of July 2013 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.