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ATP pilot of glasair has indication of a high cylinder head temperature. Was on an IFR climb with bos departure control. Saw hole over 9b1 airport and spiraled through. Pilot had elected that action. 9b1 runway too short to use, he scud runs under a 500 ft ceiling to 6b6 airport for landing. Defective probe in #2 cylinder.
| Attributes | |
| ACN | 378504 |
| Time | |
| Date | 199708 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : 9b1 airport : bed airport : 6b6 |
| State Reference | MA |
| Altitude | agl bound lower : 500 agl bound upper : 3500 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : bos |
| Operator | general aviation : personal |
| Make Model Name | Amateur (Home) Built |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : intermediate altitude other other |
| Route In Use | approach : contact enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 50 flight time total : 6000 flight time type : 400 |
| ASRS Report | 378504 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance non adherence : far other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
While climbing out IFR from hanscom field, noticed very high cylinder head temperature on #2 cylinder. Stopped climb, reduced power, notified bos departure controller I wanted to land. Was currently over airport to marlboro and there was a hole. Elected to spiral down. Tried an approach, but runway length of 1700 ft was too short for the plane. Aborted approach and had to 'scud run' to minute man airport, probably at 500 ft AGL or less. Probably violated a bunch of FARS, but had to exercise my authority/authorized to do so as PIC for safety of flight. As compression on 1 cylinder was a little low when pulling propeller through on preflight, I thought I might have a broken ring, or possibly a bird's nest. Turns out, it was just a faulty cylinder head temperature probe that failed by indicating high temperature before going totally OTS.
Original NASA ASRS Text
Title: ATP PLT OF GLASAIR HAS INDICATION OF A HIGH CYLINDER HEAD TEMP. WAS ON AN IFR CLB WITH BOS DEP CTL. SAW HOLE OVER 9B1 ARPT AND SPIRALED THROUGH. PLT HAD ELECTED THAT ACTION. 9B1 RWY TOO SHORT TO USE, HE SCUD RUNS UNDER A 500 FT CEILING TO 6B6 ARPT FOR LNDG. DEFECTIVE PROBE IN #2 CYLINDER.
Narrative: WHILE CLBING OUT IFR FROM HANSCOM FIELD, NOTICED VERY HIGH CYLINDER HEAD TEMP ON #2 CYLINDER. STOPPED CLB, REDUCED PWR, NOTIFIED BOS DEP CTLR I WANTED TO LAND. WAS CURRENTLY OVER ARPT TO MARLBORO AND THERE WAS A HOLE. ELECTED TO SPIRAL DOWN. TRIED AN APCH, BUT RWY LENGTH OF 1700 FT WAS TOO SHORT FOR THE PLANE. ABORTED APCH AND HAD TO 'SCUD RUN' TO MINUTE MAN ARPT, PROBABLY AT 500 FT AGL OR LESS. PROBABLY VIOLATED A BUNCH OF FARS, BUT HAD TO EXERCISE MY AUTH TO DO SO AS PIC FOR SAFETY OF FLT. AS COMPRESSION ON 1 CYLINDER WAS A LITTLE LOW WHEN PULLING PROP THROUGH ON PREFLT, I THOUGHT I MIGHT HAVE A BROKEN RING, OR POSSIBLY A BIRD'S NEST. TURNS OUT, IT WAS JUST A FAULTY CYLINDER HEAD TEMP PROBE THAT FAILED BY INDICATING HIGH TEMP BEFORE GOING TOTALLY OTS.
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.