T-Tail-Tall-Tail:
SUPERSONIC STARLIFTER
A Wild Ride
At the current time I don't have the exact date (it was in 1976) for this incident but it was a Norton aircraft/crew. John Neilson confirmed the aircraft tail number was 65-9402.
This photo was taken while 65-9402 was
sitting on the ramp at the
COMOX airport awaiting repairs following the
'supersonic' incident. Due to the
resolution of the photo you can't make out the tail
number, but trust me, it's 9042.
Copyright ©: Bill Weeper
Bill adds these comments regarding the
supersonic incident:
I was on a C-141 crew that took a replacement set of
petal doors to Comox RCAFB
Canada after the incident with 65-9402. We took the
old set back to Norton. One
of the petal doors had a large chunk taken out of
the door (at narrow end). It
sat there for quite a while getting repaired. A
loadmaster friend of mine
(George Spaulding) was on board 402 when the
incident occurred. I can't
remember any of the other crew member's names.
Bill Weeper
Copyright ©: Paul Minert, Date: November 1980
Copyright © 1976, John Neilson, Date: 2000 at the boneyard
While cruising at FL390, and without warning the
aircraft nose swung sharply
to the right. The pilot disconnected the autopilot,
and yaw damper. The Dutch
Roll became worse. He started a descent and regained
control at FL310. After
the aircraft landed, the #2 and #3 yaw damper rate
gyros were replaced and the
write-up was signed off.
The next day while returning to home base, cruising
at FL410, the crew felt a
couple small jolts. They disconnected the autopilot
and waited. After a few
moments when nothing more was felt, they reconnected
the autopilot. Moments
later the nose slammed violently to the right. The
pilot again disconnected the
autopilot and yaw damper. He attempted to control
the Dutch Roll with aileron.
Within seconds the aircraft was partially inverted.
The rolling and yawing
continued as pitch reached 90 degrees nose down.
Loose objects flew around the
cockpit. The crew bunk mattress and the Navigator
wound up lying across the
instrument panel, hindering vision and control
movements.
The pilot regained control and recovered from the
high-speed dive at 17,000
feet. The crew performed a controllability check and
recovered the aircraft to
the nearest military base, Comox RCAFB in Canada.
Large pieces of the upper
wing skin, and pieces of both petal doors were
missing.
Flight recorder data indicated "G" loadings of+3.18
to -3.52 and a maximum of
450 KIAS Investigators were unable to confirm the
maximum Mach, but suspect
that it had exceeded Mach 1.0.
Accident investigators found that the aircraft had
experienced seven yaw
related flight control malfunctions, none given a
red "X". A dual malfunction
of the autopilot junction box and the yaw damper
control panel caused
intermittent spurious signals to the yaw damper, yet
gave a satisfactory test
indication.