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Rotary winged aircraft IAP non precision approach in IMC. Aircraft equipment problem with altitude hold in autoplt creates pitch up and temporary loss of aircraft control.
| Attributes | |
| ACN | 352640 |
| Time | |
| Date | 199611 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : hfd |
| State Reference | CT |
| Altitude | agl bound lower : 100 agl bound upper : 400 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : hfd |
| Operator | general aviation : corporate |
| Make Model Name | Helicopter |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach other other |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 10000 flight time type : 900 |
| ASRS Report | 352640 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : published procedure non adherence : clearance other anomaly other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency flight crew : overcame equipment problem flight crew : regained aircraft control other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
Autoplt leveled helicopter at a 400 ft MDA during a coupled non precision instrument approach. Moments later autoplt commanded an abrupt pitch-up causing airspeed decrease from 60 KIAS to zero with a low power setting. Helicopter began falling vertically as maximum power was applied. The aircraft was recovered below 100 ft in ground effect and flown to a missed approach without further incident.
Original NASA ASRS Text
Title: ROTARY WINGED ACFT IAP NON PRECISION APCH IN IMC. ACFT EQUIP PROB WITH ALT HOLD IN AUTOPLT CREATES PITCH UP AND TEMPORARY LOSS OF ACFT CTL.
Narrative: AUTOPLT LEVELED HELI AT A 400 FT MDA DURING A COUPLED NON PRECISION INST APCH. MOMENTS LATER AUTOPLT COMMANDED AN ABRUPT PITCH-UP CAUSING AIRSPD DECREASE FROM 60 KIAS TO ZERO WITH A LOW PWR SETTING. HELI BEGAN FALLING VERTLY AS MAX PWR WAS APPLIED. THE ACFT WAS RECOVERED BELOW 100 FT IN GND EFFECT AND FLOWN TO A MISSED APCH WITHOUT FURTHER INCIDENT.
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.