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1. 11:45 AM - Tiger Crash: 11/12/99 (Gary Vogt)
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| Subject: | Tiger Crash: 11/12/99 |
This was forwarded to me from gg because it happened in my backyard (sort o
f).-=0A==============0A=0AI was called to go lo
ok at the wreckage in Van Nuys by one of the accident investigators who was
also my AP/AI mentor.=0A=0AI saw the wing and the aileron and noticed the
missing counterweights. -The counter-weight holes in both wingtips had a
tear in the fiberglass where the counterweight arm might go through IF the
counterweight had been far enough down into the wind to where the drag on t
he counterweight might pull it backwards. -I noted the aileron stops. -
=0AThe aileron stops WERE STILL THERE AND THEY HAD NO DAMAGE.=0A=0AMy concl
usion, to the friend of mine, was that counterweight had been installed wro
ng with the bolt that acts as the stop not installed where it should be.
-=0A=0ASarcastic note: -Quote: -"You don't need a Grumman specific me
chanic to work on a Grumman."=0A=0AForward to GG if you wish.=0A===
===========0A=0A"On November 12, 1999, at 1738 hours Pa
cific standard time, an American General AG5B, N1195L, was substantially da
maged by an encounter with in-flight turbulence while on downwind leg for l
anding at the Van Nuys, California, municipal airport. ......=0A=0AThe pilo
t reported that ...... there was an instantaneous jolt of sudden severe tur
bulence that ended before he could take any action. His left hand was on th
e flight controls and his right hand was on the throttle. The pilot said th
e flight control in his left hand felt "like the handle of a sledge hammer
when you strike a steel pipe.-=0A=0A.... He felt that the speed was norma
l, there was no shrieking or wind noise, and the pilot made no control inpu
t before or after the turbulence.=0A---------------- I don't believe this.
-Anyone who has ever been hit with the slightest turbulence instinctively
corrects, or over corrects, it.=0A=0A=0AOne of the aileron mass balance we
ights was located on November 16, 1999, in the bedroom of an unoccupied apa
rtment where it had penetrated the roof and ceiling. The apartment is locat
ed beneath the downwind leg flight path on the east side of the airport app
roximately midfield.-=0A---------------- I'd like to have seen this. -I
t hadn't been located yet.=0A=0AThe Safety Board investigator examined the
aircraft on November 16, 1999. Each wing is assembled in three sections, wh
ich are spliced together. The tip section of the left wing, outboard of the
second splice, was deformed upward about 5 degrees with respect to the inb
oard section of the wing. The upper wing skin exhibited compression bucklin
g. In comparing the two damage areas, the buckling was substantial on the o
utboard wing section and modest on the upper wing skin inboard of the tip s
plice. The right wing exhibited modest compression buckling over its entire
span but was not visibly deformed. There was no visible damage to the fuse
lage, empennage, or landing gear. The mass balance weights on both ailerons
were absent. The steel tubes supporting the mass balances separated immedi
ately forward of the weld attachment to the aileron torque tube in the vici
nity of the heat affected region of the weld. Both failures exhibited a she
ar lip on the top portion
and downward bending on the bottom portion. There was no damage to control
stops or evidence of over-travel."=0A----------------- NOTE: -"There was
no damage to control stops or evidence of over-travel."=0AIf the counterwe
ight had been installed correctly, the forces needed to tear off the weight
would have also ripped out the stop.
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