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NTSB Report
September 19, 1986 · Forbes-Wolfram Special DSA-1M · N99QB
St. Johns, AZ
Overview
Report Status
Preliminary report
Event Type
Accident
Date
September 19, 1986
Injury Outcomes
No injuries (1 uninjured)
Location
St. Johns, AZ
Aircraft
Forbes-Wolfram Special DSA-1M
Tail Number
N99QB
Injuries
None
Aircraft Damage
Substantial
NTSB Number
LAX86FUJ06
THE PLT REPORTED THAT PERSONS OVER 5 FT 9 IN TALL EXPERIENCE LIMITED RIGHT AILERON CONTROL AUTHORITY DUE TO THE SMALL COCKPIT OF THE HOMEBUILT EXPERIMENTAL ACFT, WHICH IS USED EXCLUSIVELY FOR AIR RACING. THE PLT SAID THE RIGHT KNEE OF TALL PERSONS LIMITS THE CONTROL STICK MOVEMENT TO 'ABOUT 2/5THS OF THE AVAILABLE TRAVEL.' THE ACFT HAS NO ELEC SYSTEM & MUST BE FLOWN X-COUNTRY WITH ANOTHER ACFT FOR COM & NAV CAPABILITY. THE ACFT WAS BEING ESCORTED BY A HARVARD MK VII ACFT. THE PLT SAID HE DEPARTED IMMEDIATELY BEHIND THE HARVARD & ENCOUNTERED 'THE WING VORTEX' FROM IT, WHICH ROLLED THE AIRCRAFT TO THE LEFT AT AN ALT OF 6 FT AGL. THE PILOT SAID THAT WITH THE LIMITED RIGHT AILERON AUTHORITY, HE COULD NOT ARREST THE ROLL RATE PRIOR TO REACHING THE INVERTED POSITION. THE PILOT SAID HE THEN LANDED THE AIRCRAFT 'STRAIGHT AHEAD AS GENTLY AS POSSIBLE.'
Full Narrative
THE PLT REPORTED THAT PERSONS OVER 5 FT 9 IN TALL EXPERIENCE LIMITED RIGHT AILERON CONTROL AUTHORITY DUE TO THE SMALL COCKPIT OF THE HOMEBUILT EXPERIMENTAL ACFT, WHICH IS USED EXCLUSIVELY FOR AIR RACING. THE PLT SAID THE RIGHT KNEE OF TALL PERSONS LIMITS THE CONTROL STICK MOVEMENT TO 'ABOUT 2/5THS OF THE AVAILABLE TRAVEL.' THE ACFT HAS NO ELEC SYSTEM & MUST BE FLOWN X-COUNTRY WITH ANOTHER ACFT FOR COM & NAV CAPABILITY. THE ACFT WAS BEING ESCORTED BY A HARVARD MK VII ACFT. THE PLT SAID HE DEPARTED IMMEDIATELY BEHIND THE HARVARD & ENCOUNTERED 'THE WING VORTEX' FROM IT, WHICH ROLLED THE AIRCRAFT TO THE LEFT AT AN ALT OF 6 FT AGL. THE PILOT SAID THAT WITH THE LIMITED RIGHT AILERON AUTHORITY, HE COULD NOT ARREST THE ROLL RATE PRIOR TO REACHING THE INVERTED POSITION. THE PILOT SAID HE THEN LANDED THE AIRCRAFT 'STRAIGHT AHEAD AS GENTLY AS POSSIBLE.'
Flight
Event TypeAccident
Event Time11:30 MST
Nearest AirportSt. Johns Industr. (0nm N)
Runway20
Runway Length3400 ft
Runway Width60 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftForbes-Wolfram Special DSA-1M
Tail NumberN99QB
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-320-A2B · Reciprocating · 150
Seats1
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 34 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind210° @ 15 kt, gusting 20 kt
Visibility60 sm
CeilingOvercast 4000 ft
Temperature / Dew Point0 C
Altimeter30.00 inHg
Weather SourceWIT