# TCDS 4H10: Siam Hiller Holdings Inc.

- Type: Type certificate data sheet
- Status: Current
- Holder: Siam Hiller Holdings Inc.
- Revision: 7
- Revised: October 28, 2014
- Product: Aircraft, Rotorcraft
- Certification basis: CAR 6
- Registered aircraft: 32, by the registry models matched to it (OpenAirDocs)
- Data sheet PDF: https://openairdocs.org/files/sha256/46/ab/46ab60836f888c1009e09e54a5bee71910d0b81cc6b904e15693931730c1fad4
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/83211C0FA4210A2386257ED000638906.0001
- Page: https://openairdocs.org/tcds/4H10

## Models (1)

As the data sheet lists them.

- UH-12D

## What the data sheet says

From the PDF's text layer, line by line; tables lose their columns. The PDF is the record.

```text
DEPARTMENT OF TRANSPORTATION 
FEDERAL AVIATION ADMINISTRATION 
4H10  
REV  7 
SIAM HILLER 
UH-12D 
(ARMY H-23D) 
 
October 28, 2014 
TYPE CERTIFICATION DATA SHEET NO. 4H10 
 
This data sheet which is a part of type certificate No. 4H10 prescribes conditions and limitations under which the 
product for which the type certificate was issued meets the airworthiness requirements of the Civil Air Regulations. 
 
Type Certificate Holder: Siam Hiller Holdings, Inc. 
925 M. Street 
Firebaugh, California 93622-2234 
  
Type Certification Ownership Record: Hiller Aircraft Corporation transferred to  
Fairchild Industries, Inc. on 10/2/1959 
  
 Fairchild Industries, Inc. transferred to 
Heli-Parts, Inc. on 12/28/1972 
  
 Heli-Parts, Inc. transferred to 
Hiller Aviation on 12/28/1972 
  
 Hiller Aviation transferred to 
Rogerson Aircraft Corporation on 6/26/1984 
  
 Rogerson Aircraft Corporation transferred to 
Hiller Helicopters, a wholly owned subsidiary of 
Rogerson Aircraft Corporation on 6/29/1984 
  
 Hiller Helicopters, a wholly owned subsidiary of 
Rogerson Aircraft Corporation transferred to 
Rogerson Hiller Corporation on 11/14/1985 
  
 Rogerson Hiller Corporation transferred to  
Siam Hiller Holdings, Inc. on 7/14/1994 
 
1. MODEL UH-12D (Army H-23D), UTILITY CATEGORY, APPROVED DECEMBER 23, 1957 
 
Engine Lycoming VO-435-A1C  
   
Fuel 80/87 Min. grade aviation gasoline  
   
Engine limits  
  for all operations 
Maximum RPM 3200 (250 HP)

4H10 2 
 
 
 Power Off (Rotor Tach) Power on (Engine Tach.)  
Rotor limits and  
  engine operating  
  speeds 
Maximum 395  
Minimum 314 
Maximum 3200 RPM  
Minimum (S.L. to 6000 ft.) 2900 RPM  
(Above 6000 ft., increase minimum RPM 
by 33 RPM for each additional 1000 ft. of 
altitude). 
  
Airspeed limits Configuration VNE  (Never Exceed)  IAS 
 Skid Gear 83 Knots 
 Skid and Litters 66 Knots 
    Note:  The above airspeeds apply from S.L. to 2000 ft.  Decrease Vne 2.0 knots 
per 1000 ft. of altitude above 2000 ft. For limits with other accessories, see FAA 
approved Rotorcraft Flight Manual. 
   
Altitude limits Avoid operation areas as shown in approved Flight Manual. 
  
C.G. range  Configuration 
 Skid Gear (79.5) to (84.8) 
 Skid & Litters (79.5) to (84.8) 
 For range with other accessories see FAA Approved Rotorcraft Flight Manual 
Empty weight C.G. range None 
  
Datum 107.25 in. fwd. of tail boom-fuselage upper mounting face. 
  
Leveling means Top face of flanges under seat 
  
Maximum weight 2750 LBS. 
  
Number of seats 3  (53) 
  
Maximum Baggage None 
  
Fuel capacity Main tank 46 gals. (82.9) (45.8 usable) 
  
Oil capacity 2.3 gals (94) 
  
Rotor blade movements (Measured with respect to the mast)  (NOTE:  When the mast is vertical, the 
helicopter is 1° nose up) 
  
Main blades:  
   Collective pitch Low setting +1.0°, Total  travel 10.5°  (Measured at Retention Plate) (Low 
setting is determined as the lowest which will preclude overspeeding in 
autorotation) 
  
Teetering Control rotor ±12°, Main rotor ± 9° 
  
Wobble plate:  
   Lateral  ±7.7° to  ±8.3° 
   Longitudinal Fwd. 8.0° to 8.5°, Aft. 9.0° to 9.2°  
  
Control blades:  
   Neutral  +9° incidence (Rotor hub and wobble plate perpendicular to mast) 
  
Anti-torque rotor blades:  
   Flapping +17° to -17° 
   Collective pitch  +15° to -3° 
   
Horizontal stabilizer setting Configuration  
Skid Gear 
(with Helicopter level)  
0° 
 Skid and Litters  0°

4H10 3 
 
 
 (For setting with other accessories installed, see FAA approved Rotorcraft Flight 
Manual) 
  
Mfr’s. Serial Nos. eligible UH-12D:  None.   H-23D: 938 through 1034 and 1046 through 1438 except 942 
and 954.  In order for individual Model H-23D helicopters procured under 
military cognizance and not having been issued a Form ACA-970, “Conformity 
Certificate - Military Aircraft,” to be eligible for airworthiness certification as a 
Model UH-12D, it must be determined in each case that the helicopter conforms 
to the type design.  The manufacturer’s serial number should be used in each 
case. 
  
Required equipment  In addition to the pertinent required basic equipment specified in CAR 6, the 
following items of equipment must be installed: 1, 2, 3, 4, 6, 101, 102, 103, 104, 
105, 106, 107, 108, 109, 110, 111, 205, 206, 301, 302, 303, 304, 309, 405, 602.  
  
Specifications Pertinent to All Models 
  
   Certification basis Type Certificate No. 4H10 (CAR 6 as amended August 25, 1955) 
  
   Production basis Production Certificate No. 423WE, Spare Parts Only 
  
   Equipment:  
  Rotors and Rotor Equipment 
  
  1. 2 main rotor blades    
 (a)  Parsons Dwg. 2253-1101-02, (b)  2253-1101-03, (c)  2253-1101-04 158 lbs.     (84) 
     
  2. 2 control blades   33lbs. (84) 
 (a)   Hiller Dwg. 36123   
    
  3. 2 tail rotor blades    
 (a)  Hiller Dwg. 55073   6 lbs. (328) 
     
  4. Collective pitch ballast system   
 (a)  Hiller Dwg. 30026   5 lbs. (84) 
     
  5. Dual control kit installation   
 (a)  Hiller Dwg. 30020    13 lbs. (50) 
     
  6. 2 Vibration absorbers     
 (a)  Hiller Dwg. 33023-3    3 lbs. (73) 
  7. 2 Control rotor spar fairings   
 (a)  Hiller Dwg. 36003    2 lbs. (84) 
     
  8. Rotor brake installation (Item 405 (b) required)   
 (a)  Hiller Dwg. 22000    8 lbs. (74) 
     
ENGINE AND ENGINE ACCESSORIES - FUEL AND OIL SYSTEMS  
     
  101. Oil cooler    
 (a)  Harrison No. 8526134 5 lbs. (76) 
  
  102. Engine air intake system    
 (a)  Hiller Dwg. 76259 and 76190   3 lbs. (102)

4H10 4 
 
 
  103. Fuel pump    
 (a)  Lear Romec RD7430-5A, RG15980E   1 lb. (85) 
    
  104. Auxiliary fuel pump    
 (a)  Lear Romec RG15150-B, or H   3 lbs. (78) 
    
  105. Fan, Hiller Dwg. 74150   3 lbs. (78) 
     
  106. Carburetor zone support bracket, Hiller Dwg. 75060  1 lb. (97) 
     
  107. Starter    
 (a)  AN4116R1A or equivalent   20 lbs. (84) 
     
  108. Unusable fuel   (See Note 1 for definition)  1 lb. (70) 
     
  109. Trapped fuel    (when drained in normal ground attitude from tank) 6 lbs. (84) 
     
  110. Trapped oil   (when drained in normal ground attitude from tank) 4 lbs. (94) 
     
  111. 2 Tachometer generators   3 lbs. (78) 
     
LANDING GEAR    
     
  205. Skid type gear, less scuff plates, handling wheels and axles  
 (a)  Hiller Dwg. 32036   84 lbs. (73) 
     
  206. Tail skid, Hiller Dwg. 42202-7   1 lb. (303) 
     
  207. Skid gear scuff plates installation   
 (a)  Hiller Dwg. 43015 and 43016  4 lbs. (44) 
    
  208. Float gear installation (Item 405 (b) required)   
 (a)  Hiller Dwg. 44012  154 lbs. (81) 
    
ELECTRICAL EQUIPMENT    
    
  301. Generator    
 (a)  Eclipse Pioneer 30B24-1-A or equivalent  14 lbs. (85) 
    
  302. Battery    
 (a)  Standard (AN-3151-2)   52 lbs. (75) 
     
  303. Voltage regulator, G.E. CR2795E-100AL  5 lbs. (91) 
    
  304. Generator cutout, Hartman No. A-718AP  3 lbs. (82) 
    
  306. Landing and navigation light kit   
 (a)  Hiller Dwg. 83217  2 lbs. (45) 
    
  309. Standard battery rack installation, Hiller Dwg. 61417, less battery 1 lb. (75) 
   
  310. Alternator  
 (a)  Jasco 7555-1-72 per Hiller Dwg. 83230 (alternate for Items 301(a), 303 and 
304) 
13 lbs. (85) 
Interior Equipment 
 
  405. (a)  Hiller Helicopter Model UH-12D FAA Approved Flight Manual dated December 23, 1957.

4H10 5 
 
 
  
 (b)  Hiller Helicopter Model UH-12D FAA Approved Flight Manual Revision dated October 2, 1959 or 
subsequent FAA Approved Revisions.  (Required with Items 8, 208, 605 and 608). 
  
 (c)  Hiller Helicopter Model UH-12D FAA Approved Flight Manual Revision dated March 25, 1960 or 
subsequent FAA Approved Revisions.  (Required with Items 609, 610 and 611). 
  
Miscellaneous (not listed above) 
 
  601. Cabin heater installation 
 (a)  Hiller Dwg. 88044 1 lb. (63) 
  
  602. Ballast bar  
 (See loading instructions in Flight Manual regarding Ballast location and necessity for its use) 
 (a)  Hiller Dwg. 62244 9 lbs 
  
  605. Litter installation (2) Hiller Dwg. 96190 with skid gear (Item 606 must also be 
installed - installation of litters must be in pairs only on skid gear - right hand litter 
may be removed on float gear - right hand litter may be removed on float gear 
installation - Heater Installation, Hiller Dwg. 88018 is optional - Item 405 (b) 
required) 60 lbs. (75) 
  
  606. Litter shoulder harness (2), Hiller Dwg. 96191 6 lbs. (68) 
  
  607. Shoulder harness installation Hiller Dwg. 85053 or 85067.  (If this item is removed, 
the seat back support cables are to be retained) 
14 lbs. (63) 
  
  608. Cargo rack installation with skid gear & float gear (Item 405 (b) required) 
 (a)  Hiller Dwg. 98003 34 lbs. (66) 
  
  609. Rescue hoist installation - operation involving use of rescue hoist permitted in restricted category only 
(Item 405 (c) required) 
 (a)  Hiller Dwg. 96140 66 lbs. (72) 
  
  610. Cargo hook installation - operation with load on cargo hook permitted in restricted category only (Item 405 
(c) required) 
 (a)  Hiller Dwg. 91012 9 lbs. (73) 
  
  611. Auxiliary fuel tank installation (Item 405 (c) required) 
 (a)  Hiller Dwg. 72025 48 lbs. (85) 
  
NOTE 1.    Current weight and balance report including list of equipment included in certificated weight empty, 
and loading instructions must be in each helicopter at the time of  original certification and at all 
times thereafter (except in the case of air carrier operators having an approved weight control 
system).  Ballast, when necessary, must be carried in accordance with Loading Instructions in the 
Approved Flight Manual. 
 Fuel and oil capacities as indicated are total tank capacities over and above “Trapped Fuel and Oil.”  
The fuel tank capacity includes “Unusable” fuel of 0.2 gallons, which cannot be used safely in all 
flight attitudes, and which must be included in the empty weight. 
  
NOTE 2.    The following placards must be installed so as to be in full view of the pilot : 
 (a)  Below airspeed indicator:  “Decrease Vne 2.0 knots per 1000 feet of altitude above 2000 feet.” 
 (b)  Below tachometer:  “Above 6000 ft, see operating limitations.” 
 (c)  On cabin heater outlet:  “Use cabin heat in cruise and climb only.” 
 (d)  On pilot’s checklist:

4H10 6 
 
 
  (1)  If ash tray is not installed:  “No smoking.” 
  (2)  “This helicopter must be operated in compliance with the operating limitations in the FAA 
approved Rotorcraft Flight Manual.” 
  (3)  “Instrument flight prohibited” 
  (4)  “No acrobatic maneuvers approved.” 
  (5)  “Unsymmetrical loading must be to the left.” 
  (6)  “Avoid protracted rearward flight.” 
  (7)  “See Loading Instructions in Flight Manual.” 
 (e)  On removable ballast weight:  “See Loading Instructions in Flight Manual for proper usage. 
  NOTE 3.   Information essential to the proper maintenance of the rotorcraft (helicopter) including retirement 
times of critical parts is included in the manufacturer’s maintenance instructions provided with each 
rotorcraft.  These values of retirement or service life cannot be increased without FAA Engineering 
approval. 
  NOTE 4.   These helicopters must be serviced and maintained in conformance with instructions given by Hiller 
Helicopters in the pertinent model inspection guide, repair handbook, and service and overhaul 
manuals. 
 
NOTE 5. 
 
Certain part numbers used on this model helicopter may be used on other model helicopters in which 
their use is life limited. These part numbers are listed in TCDS 4H11, H1WE, 4H10, 6H1, and 6H2 
and FAA approved Hiller Instructions for Continued Airworthiness. If a full and complete service 
history from manufacture forward is not available that demonstrates these parts were used only on a 
model helicopter for which the part is not life limited then those parts shall be life limited to the 
lowest number of hours given in those TCDS’s or ICAs. If a full and complete service history from 
the manufacturer forward is available, and any operating time has occurred in a life limited model 
helicopter, that part shall be considered life limited at the lowest life limit listed even if transferred 
and used on a helicopter model for which it is not life limited. Only those parts for which a full and 
complete service history from manufacture forward is available and which shows only operating time 
on a helicopter model for which it is not life limited are considered not life limited. 
 
  
-END-
```

## ADs (41, in force first)

- [AD 2000-24-21](https://openairdocs.org/ad/2000-24-21): Control System Linkage · Hiller UH-12, UH-12A, UH-12B and 6 more. Effective Jan 10, 2001
- [AD 97-20-15](https://openairdocs.org/ad/97-20-15): Outboard Tension-Torsion Bar Pin · Hiller UH-12A, UH-12B, UH-12C and 2 more. Effective Nov 12, 1997
- [AD 97-10-16](https://openairdocs.org/ad/97-10-16): Blade Spar Tube and Cuff Inspection · Allison 250-C20/250-C20B engine (Siam Hiller Holdings STC SH177WE or SH178WE). Effective Jun 27, 1997
- [AD 86-22-04](https://openairdocs.org/ad/86-22-04): Main Rotor Blades · Hiller UH-12D, UH-12E and UH-12E-L with STC SH177WE or SH178WE. Effective Nov 3, 1986
- [AD 86-17-02](https://openairdocs.org/ad/86-17-02): Main Rotor Blade Fork · Hiller UH-12D, UH-12E and UH-12E-L with STC SH177WE or SH178WE. Effective Aug 22, 1986
- [AD 84-19-08](https://openairdocs.org/ad/84-19-08): Engine Mount · Hiller UH-12D, UH-12E and UH-12E-L with STC SH177WE or SH178WE. Effective Sep 20, 1984
- [AD 83-25-02](https://openairdocs.org/ad/83-25-02): Main Rotor Blade Doublers · Allison 250-C20/250-C20B engine (Siam Hiller Holdings STC SH177WE). Effective Dec 29, 1983
- [AD 82-15-02](https://openairdocs.org/ad/82-15-02): Main And Tail Rotors · Hiller UH-12D, UH-12L, UH-12L4 and 2 more. Effective Jul 16, 1982
- [AD 81-18-02](https://openairdocs.org/ad/81-18-02): Tail Rotor Skin Cracks · Hiller UH-12, UH-12A, UH-12B and 6 more. Effective Sep 10, 1981
- [AD 81-17-03](https://openairdocs.org/ad/81-17-03): Main Transmission · Hiller UH-12, UH-12A, UH-12B and 6 more. Effective Aug 24, 1981
- [AD 81-17-01](https://openairdocs.org/ad/81-17-01): Starting Vibrator Assemblies · Bendix Starting Vibrator Assemblies, B-2, B-2A and 49 more. Effective Aug 13, 1981
- [AD 81-09-08](https://openairdocs.org/ad/81-09-08): Main Rotor Blade · Hiller UH-12D and UH-12E with STC SH177WE or SH178WE. Effective Jun 25, 1981
- [AD 81-04-01](https://openairdocs.org/ad/81-04-01): Rudder Cable Assembly · Hiller UH-12D, UH-12L and UH-12E. Effective Feb 9, 1981
- [AD 80-23-02](https://openairdocs.org/ad/80-23-02): Turbine Power Conversions · Allison 250-C20/250-C20B engine (Siam Hiller Holdings STC SH177WE or 2 others). Effective Nov 20, 1980
- [AD 80-19-02](https://openairdocs.org/ad/80-19-02): Turbine Power - Soloy Conversions · Hiller UH-12D and UH-12E with STC SH177WE or SH178WE. Effective Oct 11, 1980
- [AD 80-07-04](https://openairdocs.org/ad/80-07-04): Main Rotor Blade Anti-Node Bars · Hiller UH-12, UH-12D and UH-12E. Effective Mar 31, 1980
- [AD 79-03-07](https://openairdocs.org/ad/79-03-07): Main Rotor Tachometer Generator · Hiller UH-12D and UH-12E with STC SH177WE or SH178WE. Effective Feb 21, 1979
- [AD 78-23-07](https://openairdocs.org/ad/78-23-07): Finite Life Components Listed in AD · Hiller UH-12D and UH-12E. Effective Dec 14, 1978
- [AD 78-22-08](https://openairdocs.org/ad/78-22-08): Flight/Engine Control · Hiller UH-12D and UH-12E with STC SH177WE or SH178WE. Effective Nov 30, 1978
- [AD 78-22-02](https://openairdocs.org/ad/78-22-02): Rotor Blade Retention System · Hiller UH-12D and UH-12E. Effective Oct 27, 1978
- [AD 78-18-03](https://openairdocs.org/ad/78-18-03): Drive Shaft · Hiller UH-12D and UH-12E with STC SH177WE or SH178WE. Effective Oct 6, 1978
- [AD 77-24-03](https://openairdocs.org/ad/77-24-03): Fuel Control Valve · Hiller UH-12C, UH-12D, UH-12L and 3 more. Effective Jan 6, 1978
- [AD 75-10-01](https://openairdocs.org/ad/75-10-01): Rotor Drive System · Hiller UH-12D, UH-12L, UH-12L4 and 2 more. Effective May 8, 1975
- [AD 61-05-04](https://openairdocs.org/ad/61-05-04): Main Transmission · Hiller UH-12D and UH-12E. Effective Jun 4, 1974
- [AD 74-04-03](https://openairdocs.org/ad/74-04-03): Main Rotor Drag Struts · Hiller UH-12D and UH-12E. Effective Feb 18, 1974
- [AD 73-25-03](https://openairdocs.org/ad/73-25-03): Finite Life Components · Hiller UH-12D. Effective Jan 10, 1974
- [AD 73-20-03](https://openairdocs.org/ad/73-20-03): Main Rotor Hub · Hiller UH-12, UH-12A, UH-12B and 4 more. Effective Oct 30, 1973
- [AD 71-25-08](https://openairdocs.org/ad/71-25-08): Inspect Main Rotor Blades · Hiller UH-12, UH-12A, UH-12B and 6 more. Effective Dec 14, 1971
- [AD 69-13-07](https://openairdocs.org/ad/69-13-07): Collective Yoke Support Brackets · Hiller UH-12D, UH-12L, UH-12L4 and 2 more. Effective Apr 30, 1970
- [AD 69-08-08](https://openairdocs.org/ad/69-08-08): Tail Rotor Yoke · Hiller UH-12D, UH-12L, UH-12L4 and 2 more. Effective Apr 23, 1969
- [AD 67-08-03](https://openairdocs.org/ad/67-08-03): Cyclic Control Bracket · Hiller UH-12D and UH-12E. Effective Mar 9, 1967
- [AD 66-22-04](https://openairdocs.org/ad/66-22-04): Mercury Clutches · Hiller UH-12D, UH-12L, UH-12L4 and 2 more. Effective Sep 2, 1966
- [AD 2015-20-51](https://openairdocs.org/ad/2015-20-51): Hiller UH-12, UH-12A, UH-12B and 6 more
- [AD 58-02-03](https://openairdocs.org/ad/58-02-03): Carburetor Mixture Control Removal · Hiller UH-12, UH-12A, UH-12B and 2 more
- [AD 59-05-05](https://openairdocs.org/ad/59-05-05): Cyclic Control Scissor Casting · Hiller UH-12, UH-12A, UH-12B and 3 more
- [AD 59-25-03](https://openairdocs.org/ad/59-25-03): Wobble Plate Screws · Hiller UH-12, UH-12A, UH-12B and 3 more
- [AD 62-06-03](https://openairdocs.org/ad/62-06-03): Transmission & Lubrication System Modification · Hiller UH-12D and UH-12E
- [AD 63-21-03](https://openairdocs.org/ad/63-21-03): Main Rotor Blades · Hiller UH-12D and UH-12E
- [AD 76-20-06](https://openairdocs.org/ad/76-20-06): Cable Freezing Control · Hiller UH-12D and UH-12E with STC SH177WE or SH178WE
- [AD 77-07-05](https://openairdocs.org/ad/77-07-05) (historical): Control Rotor Blade Spar Tube and Cuff · Hiller UH-12, UH-12A, UH-12B and 3 more. Effective Jun 20, 1977
- [AD 77-07-05 R1](https://openairdocs.org/ad/77-07-05-R1) (historical): Control Rotor Blade Spar Tube and Cuff · Hiller UH-12, UH-12A, UH-12B and 3 more. Effective Jun 20, 1977

## Registered aircraft by registry model (OpenAirDocs)

- [Hiller UH-12D](https://openairdocs.org/model/hiller-uh-12d): 22 aircraft (registry code 4360118)
- [Hiller H-23D](https://openairdocs.org/model/hiller-h-23d): 6 aircraft (registry code 4360120)
- [Hiller OH-23D](https://openairdocs.org/model/hiller-oh-23d): 2 aircraft (registry code 4360123)
- [Hiller-Osborn UH-12D](https://openairdocs.org/model/hiller-osborn-uh-12d): 2 aircraft (registry code 4361501)
- [Hiller-Houska UH-12D](https://openairdocs.org/model/hiller-houska-uh-12d): 0 aircraft (registry code 4361601)
- [Hiller-Northern UH-12D](https://openairdocs.org/model/hiller-northern-uh-12d): 0 aircraft (registry code 4361301)
- [Rogerson Hiller H-23D](https://openairdocs.org/model/rogerson-hiller-h-23d): 0 aircraft (registry code 4365003)
- [Rogerson Hiller UH-12D](https://openairdocs.org/model/rogerson-hiller-uh-12d): 0 aircraft (registry code 4365001)

## STCs approved under this data sheet (43)

- [STC SA4503NM](https://openairdocs.org/stc/SA4503NM): Remove original cloth covering and install Ceconite covering. Ceconite Division of Poly-Fiber Inc.
- [STC SH3319NM](https://openairdocs.org/stc/SH3319NM): Installation of Precise Flight Pulselite Control Unit in the
Landing /Taxi Recognition Visual Control Light system,. Precise Flight Inc
- [STC SR02704SE](https://openairdocs.org/stc/SR02704SE): Installation and maintenance of the Sunspot 36 and 46 series lights. AeroLED's Holdings LLC
- [STC SR00359BO](https://openairdocs.org/stc/SR00359BO): Installation of Parmetheus Plus LED PAR36 and PAR46 taxi and landing lights.. Whelen Aerospace Technologies
- [STC SR00420NY](https://openairdocs.org/stc/SR00420NY): Installation of Airwolf remote mounted engine oil filter Model AFC-600. Airwolf Filter, Corp
- [STC SR02487AK](https://openairdocs.org/stc/SR02487AK): Installation of L-3 Communications Avionics Systems ESI-500 Standby Instrument System. ADS-B Technologies, LLC
- [STC SR02470AK](https://openairdocs.org/stc/SR02470AK): Installation of the L-3 Communications NGT -1000/2000/2500 ADS-B System. ADS-B Technologies, LLC
- [STC SR02471AK](https://openairdocs.org/stc/SR02471AK): Installation of the L-3 Communications NGT -9000/9000R ADS-B System. ADS-B Technologies, LLC
- [STC SR02394AK](https://openairdocs.org/stc/SR02394AK): Replacement of existing landing and/or hover light bulbs with Light Emitting Diode (LED) lighting system. Seaplanes North LLC
- [STC SA00068SE](https://openairdocs.org/stc/SA00068SE): Installation of fuel flow/pressure instruments. (W/TSIO-360-MB1). Electronics International Inc.
- [STC SA2693NM](https://openairdocs.org/stc/SA2693NM): Installation of Electronics International digital volt/amp gauges and accessories.. Electronics International Inc.
- [STC SA593CH](https://openairdocs.org/stc/SA593CH): Install Champion SlickSTART magneto booster system.. Champion Aerospace LLC
- [STC SA02033AT](https://openairdocs.org/stc/SA02033AT): Modification to install an air-oil separator to prevent oil from being aspirated from the engine breather line.. M-20 Oil Separators LLC
- [STC SH247NW](https://openairdocs.org/stc/SH247NW): Installation and maintenance of exhaust ejector engine oil cooler system. (UH-12D (ARMY UH-23D modified per STC SH177WE). Siam Hiller Holdings Inc
- [STC SH295NW](https://openairdocs.org/stc/SH295NW): Installation of Hiller auxiliary fuel tanks kit No 72041. (UH-12D (ARMY UH-23D) modified per STC SH177WE). Siam Hiller Holdings Inc
- [STC SH297NW](https://openairdocs.org/stc/SH297NW): Installation and maintenance of a cabin heater system. (UH-12D (ARMY UH-23D modified per STC SH178WE). Siam Hiller Holdings Inc
- [STC SH299NW](https://openairdocs.org/stc/SH299NW): Installation of Soloy cargo racks.. Siam Hiller Holdings Inc
- [STC SH321NW](https://openairdocs.org/stc/SH321NW): Installation of a Bendix fuel control/power governor system on the Allison 250-C20 turbine powered Hiller UH-12D rotorcraft. (UH-12D (ARMY UH-23D) modified per STC SH177WE). Siam Hiller Holdings Inc
- [STC SH338NW](https://openairdocs.org/stc/SH338NW): Installation of transmission oil cooling system on the Allison250-C20 turbine powered Hiller UH-12D rotorcraft. (UH-12D (ARMY UH-23D modified per STC SH177WE). Siam Hiller Holdings Inc
- [STC SH380NW](https://openairdocs.org/stc/SH380NW): Installation and maintenance of engine auto reignition system. (UH-12D (ARMY UH-23D) modified per STC SH177WE). Siam Hiller Holdings Inc
- [STC SH505NW](https://openairdocs.org/stc/SH505NW): Installation of cargo release pedal.. Siam Hiller Holdings Inc
- [STC SH559NW](https://openairdocs.org/stc/SH559NW): Installation and maintenance of engine inlet air cleaner system. (UH-12D (ARMY UH-23D) modified per STC SH177WE). Siam Hiller Holdings Inc
- [STC SA00680SE](https://openairdocs.org/stc/SA00680SE): Installation of Electronics International model UBG-16 or UBG-16T bar graph engine analyzer.. Electronics International
- [STC SH177WE](https://openairdocs.org/stc/SH177WE): Installation of Allison 250-C20/250-C20B engine and related changes.. Siam Hiller Holdings Inc
- [STC SH287NW](https://openairdocs.org/stc/SH287NW): Installation of Hiller landing gear float kit No. 44012. (UH-12d (ARMY UH-23D modified per STC SH177WE). Siam Hiller Holdings Inc
- [STC SH475NW](https://openairdocs.org/stc/SH475NW): Installation of an agricultural spray system. (UH-12D (ARMY UH-23D) modifier per STC). Siam Hiller Holdings Inc
- [STC SR01430LA](https://openairdocs.org/stc/SR01430LA): Installation of Stainless Steel Skid shoes.. Papas Gary Los Angeles Laboratories Inc.
- [STC SA01258SE](https://openairdocs.org/stc/SA01258SE): Installation of the Automatic Flagman Dispenser Models in accordance with Automatic Flagman Master Drawing Lists specified in attached AML, or later FAA approved revision.This STC supercedes several existing STC s as listed in the notes on the attached AML.. R-S Sales Inc.
- [STC SA02520AT](https://openairdocs.org/stc/SA02520AT): Installation of M-20 Oil Separator, model 600-WP.. M-20 Oil Separators LLC
- [STC SH849NW](https://openairdocs.org/stc/SH849NW): Installation of North American Industries, Inc., Model No. 5 Automatic Flagman. R-S Sales Inc.
- [STC SA2687NM](https://openairdocs.org/stc/SA2687NM): Installation of Truboplus/ Electronics Int'l gauges and switches.. Aero Manufacturing Inc.
- [STC SR00135LA](https://openairdocs.org/stc/SR00135LA): Installation of Yehnert Tail Rotor Blades YH-278 as replacements for Hiller Tail Rotor Blades 55073.. Yehnert Helicopters, Inc
- [STC SA1626NM PAGE 1](https://openairdocs.org/stc/SA1626NM%20PAGE%201): Installation of Electronics Int'l Digital EGT/CHT Instruments and accessories. (201 Series). Electronics International
- [STC SA2350NM PAGE 1](https://openairdocs.org/stc/SA2350NM%20PAGE%201): Installation of Electronics International Inc digital carburetor/outside air temperature gauges. Electronics International
- [STC SH359GL](https://openairdocs.org/stc/SH359GL): Installation of Facet Enterprises engine lubrication system scavenge filter.. Facet Filter Products
- [STC SH2763SO](https://openairdocs.org/stc/SH2763SO): Installation of control rotor safety cable.. JAARS Inc.
- [STC SA4302NM](https://openairdocs.org/stc/SA4302NM): Installation of Electronics Int'l digital automatic engine analyzer.. Electronics International
- [STC SA3862NM PAGE 1](https://openairdocs.org/stc/SA3862NM%20PAGE%201): Installation of Electronics International Primary TIT/EGT/CHT instruments, remote switches and associated accessories.. Electronics International
- [STC SH3362NM](https://openairdocs.org/stc/SH3362NM): Installation of a Tail Rotor Blade Protective Coating. Columbia Helicopters Inc
- [STC SA2190NM PAGE 1](https://openairdocs.org/stc/SA2190NM%20PAGE%201): Installation of electronics International Digital Volt/Amp Gauges and Accessories.. Electronics International
- [STC SH618NW](https://openairdocs.org/stc/SH618NW): Installation of the Onboard Weighing System Adapter No. 1500, for use with Eastern Rotorcraft Cargo Hook No 2A15E. Onboard Weighing Systems
- [STC SH877SO](https://openairdocs.org/stc/SH877SO): Installation of tail rotor guard assembly.. Jungle Aviation & Radio Service, Inc.
- [STC SA2350NM](https://openairdocs.org/stc/SA2350NM) (historical): Installation of Electronics International Inc digital carburetor/outside air temperature gauges listed on the attached continuation sheet and the associated accessories.. Electronics International

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