Author Topic: c/n 004, N9991F  (Read 5862 times)

Doug Johnson

c/n 004, N9991F
« on: July 12, 2015, 07:36:23 AM »
5 pictures check your albums. Please do an internet search maybe you'll come up with one I couldn't find, I need all the help I can get.

Previous posts about N9991F or anything click on   http://flyhelio.com/smf/index.php?action=search  Enter ?
   
c/n 004, built 01/72 as Helio Stallion model AU-24A s/n 72-1330 for USAF, original registry N9553A leased by USAF for evaluation then purchased as s/n (72-21330) t/n “21330” 05/72, US Air Force Systems Command until 05/72, USAF Tactical Air Command, 4400th Special Operations Squadron (provisional), Eglin AFB FL until 07/72, placed in storage USAF Air Materiel Command, Davis-Monthan AFB until 11/72, struck off charge and transfer under MaP as t/n “21330” to "Royal Khmer AF", Pochentong AFB Cambodia accident the tail gear broke during a landing @ Battambang 06/73 incident received bullet damage at the center wing bottom skin @ unknown area 11/73 incident repaired and re-enforced several ribs on the left hand wing from damage caused by heavy vibration from the aircraft weapon @ unknown area 12/73, accident repaired damage to the left wing tip no details @ unknown area 02/74, until 04/75 escaped to Trat Thailand salvaged at Bangkok; under contract maintenance with Thai-Am at Don Muang, Bangkok 04/75, A Sealed Bid Sale, No. 62-6040, included this aircraft as Item 19. It was located at the Royal Thai Naval Air Base, Utapao, Thailand until 04/76, reg N9991F (reassigned but ntu on 007) returned to US '76, Reed, Schachle & Turinsky AK demilitarized converted to HST-550A sold '81, Ron Sutphin OR sold '81, Alfred & Tom Teufel WA sold '84, Hamilton Mobile Service co CA sold '86, James Perry VT leases to Perris Valley Skydiving CA accident destroyed Jim Lowe fatal crash after dropping skydivers the pilot entered a descent to return to the airport for another load of jumpers. He was receiving radar advisories during the drop from a TRACON controller. As the aircraft descended below 4,000 feet MSL the controller terminated the radar advisory service. Immediately after the controller discontinued the service he asked the pilot to check for a stuck microphone switch. The aircraft continued its descent and collided with a camping trailer and building under construction in an extreme nose low attitude. The elevator trim was found in the full nose down position. No other malfunctions were found @ Perris Valley CA 6/88, destroyed dereg '88, tailwheel used to repair Stallion c/n 006 almost only thing left usable

 As always any further information or pictures would be greatly appreciated.



















« Last Edit: March 09, 2021, 09:19:54 AM by Doug Johnson »
Doug

Louis

Re: c/n 004, N9991F
« Reply #1 on: July 12, 2015, 01:59:15 PM »
The elevator trim was found in the full nose down position. No other malfunctions were found

I wonder if the electrical circuit is the same as a 800   ( 295? )  There is a fault in the conception.  If you stuck the co-pilot trim switch, up or down, the results will be that the trim would always go node down when you try the pilot trim switch.  Up or down, the trim will go down.

You can check on the electrical diagram that comes with a STEC auto pilot.  This where i found the only mechanical paperwork on the 800.

Doug Johnson

Re: c/n 004, N9991F
« Reply #2 on: January 26, 2016, 10:30:54 AM »
added an article similar to the one posted with stallion c/n 006
Doug

Doug Johnson

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« Reply #3 on: January 26, 2016, 10:33:13 AM »
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Doug Johnson

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« Reply #4 on: January 26, 2016, 10:35:19 AM »
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« Last Edit: January 26, 2016, 11:01:38 AM by Doug Johnson »
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Doug Johnson

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« Reply #5 on: January 26, 2016, 10:36:38 AM »
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Doug

Doug Johnson 1

Re: c/n 004, N9991F
« Reply #6 on: May 20, 2017, 06:57:36 AM »
I found this picture of N9991F c/n 004, under a skydiver forum it caught my interest because the retractable landing Lt in the wing is quite obvious, it is located in the same area as the retractable landing Lts on both wings that were put on the H-800 c/n H-5 under direction of Clarence Brent. I checked on another stallion and apparently they were installed on both sides, it is a larger diameter Lt and located further outboard than the single Lt installed on the H-391. My H-295 had a quick remove round cover plate in that same area and it was part of my pre-flight inspection as taught by Larry Montgomery to remove and check that wear on the aileron attach bolt was normal and the cotter key was in the bolt.

I think if I had known about this previous installation on the H-391 I might have tried to install them on my H-295, and now that LED replacement bulbs are available I know I would if I wasn't able to get a field approval on the wing tips I wanted to install. I made some foam plugs for a mold to put a modified Hoerner wing tip fairing on with non-retractable Landing lts behind a clear Plexiglas fairing.

Dual retractable landing Lts have been installed on c/n 028, c/n 509, c/n H-5 and H-15 now the Hellacious Helio.

« Last Edit: May 20, 2017, 07:12:38 AM by Doug Johnson 1 »