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A beech V35 pilot landed gear up because he did not complete the gumps checklist while smoothing a rough running engine prior to landing.
| Attributes | |
| ACN | 812114 |
| Time | |
| Date | 200811 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : personal |
| Make Model Name | Bonanza 35 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach landing : roll |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : private |
| Experience | flight time last 90 days : 38.5 flight time total : 1269.3 flight time type : 952.5 |
| ASRS Report | 812114 |
| Events | |
| Anomaly | ground encounters : gear up landing non adherence : published procedure |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
On landing at ZZZ with a beechcraft V35; the gear was up. Entered pattern in VFR conditions with good visibility for landing on runway 3. Went through checklist (gumps) but was distraction by engine running a little too rough and adjusted mixture to smooth out engine; then adjusted propeller. Forgot to put gear down. Gumps means: gas; undercarriage; mixture; propeller; seatbelts. I did gas -- engine ran a little rough from pulling throttle back to slow down. Adjusted mixture skipping undercarriage (gear); did propeller. Beechcraft bonanza has an audible alarm that goes off if the manifold pressure goes below 12. This alarm did not go off as the plane slowed and manifold pressure was reduced well below 12. Distraction of rough caused the thought that gear down had been done because mixture comes after under carriage in gumps. Will use written checklist in future and the word g-gumps. G-gear; g-gas; u-undercarriage (3 green lights); m-mixture; p-prop; s-seatbelts. This will give 2 times to get the gear down properly. Will check this gear alarm in-flight more often to make sure it remains in adjustment.
Original NASA ASRS Text
Title: A BEECH V35 PILOT LANDED GEAR UP BECAUSE HE DID NOT COMPLETE THE GUMPS CHECKLIST WHILE SMOOTHING A ROUGH RUNNING ENGINE PRIOR TO LANDING.
Narrative: ON LNDG AT ZZZ WITH A BEECHCRAFT V35; THE GEAR WAS UP. ENTERED PATTERN IN VFR CONDITIONS WITH GOOD VISIBILITY FOR LNDG ON RWY 3. WENT THROUGH CHKLIST (GUMPS) BUT WAS DISTR BY ENG RUNNING A LITTLE TOO ROUGH AND ADJUSTED MIXTURE TO SMOOTH OUT ENG; THEN ADJUSTED PROP. FORGOT TO PUT GEAR DOWN. GUMPS MEANS: GAS; UNDERCARRIAGE; MIXTURE; PROP; SEATBELTS. I DID GAS -- ENG RAN A LITTLE ROUGH FROM PULLING THROTTLE BACK TO SLOW DOWN. ADJUSTED MIXTURE SKIPPING UNDERCARRIAGE (GEAR); DID PROP. BEECHCRAFT BONANZA HAS AN AUDIBLE ALARM THAT GOES OFF IF THE MANIFOLD PRESSURE GOES BELOW 12. THIS ALARM DID NOT GO OFF AS THE PLANE SLOWED AND MANIFOLD PRESSURE WAS REDUCED WELL BELOW 12. DISTR OF ROUGH CAUSED THE THOUGHT THAT GEAR DOWN HAD BEEN DONE BECAUSE MIXTURE COMES AFTER UNDER CARRIAGE IN GUMPS. WILL USE WRITTEN CHKLIST IN FUTURE AND THE WORD G-GUMPS. G-GEAR; G-GAS; U-UNDERCARRIAGE (3 GREEN LIGHTS); M-MIXTURE; P-PROP; S-SEATBELTS. THIS WILL GIVE 2 TIMES TO GET THE GEAR DOWN PROPERLY. WILL CHK THIS GEAR ALARM INFLT MORE OFTEN TO MAKE SURE IT REMAINS IN ADJUSTMENT.
Data retrieved from NASA's ASRS site as of May 2009 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.