NTSB Identification: LAX86FUJ06.
The docket is stored on NTSB microfiche number 32134.
Accident occurred Friday, September 19, 1986 in ST. JOHNS, AZ
Aircraft: FORBES-WOLFRAM SPECIAL DSA-1M, registration: N99QB
Injuries: 1 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

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.'

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

FLIGHT CONTROL SYSTEM..LACK OF

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

CLEARANCE..IMPROPER..PILOT IN COMMAND

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

REMEDIAL ACTION..NOT POSSIBLE..PILOT IN COMMAND

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

REMEDIAL ACTION..NOT POSSIBLE..PILOT IN COMMAND

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ACFT/EQUIP,INADEQUATE CONTROL LOCATION..MANUFACTURER

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ACFT/EQUIP,INADEQUATE COCKPIT/WORKPLACE..MANUFACTURER


Contributing Factors

MANEUVER..INADVERTENT..PILOT IN COMMAND


Contributing Factors

IN-FLIGHT PLANNING/DECISION..POOR..PILOT IN COMMAND

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