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A C172 pilot reports descending without authority/authorized and conflicting with an air carrier B737 that takes evasive action.
| Attributes | |
| ACN | 367885 |
| Time | |
| Date | 199705 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : mht |
| State Reference | NH |
| Altitude | msl bound lower : 3300 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mht |
| Operator | general aviation : personal |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : private |
| Experience | flight time last 90 days : 90 flight time total : 500 flight time type : 100 |
| ASRS Report | 367885 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : far |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 500 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
While descending into manchester I was cleared down to 4000 ft. Shortly thereafter I was given a sbound vector and told to enter the right downwind for the active runway. Upon hearing this instruction I incorrectly assumed that I could continue the descent to pattern altitude, and did so. This action put my aircraft in the path of a departing airliner. His TCASII apparently instructed him to climb, which he did, leaving his assigned altitude to pass over me.
Original NASA ASRS Text
Title: A C172 PLT RPTS DSNDING WITHOUT AUTH AND CONFLICTING WITH AN ACR B737 THAT TAKES EVASIVE ACTION.
Narrative: WHILE DSNDING INTO MANCHESTER I WAS CLRED DOWN TO 4000 FT. SHORTLY THEREAFTER I WAS GIVEN A SBOUND VECTOR AND TOLD TO ENTER THE R DOWNWIND FOR THE ACTIVE RWY. UPON HEARING THIS INSTRUCTION I INCORRECTLY ASSUMED THAT I COULD CONTINUE THE DSCNT TO PATTERN ALT, AND DID SO. THIS ACTION PUT MY ACFT IN THE PATH OF A DEPARTING AIRLINER. HIS TCASII APPARENTLY INSTRUCTED HIM TO CLB, WHICH HE DID, LEAVING HIS ASSIGNED ALT TO PASS OVER ME.
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.