# TCDS E-274: Lycoming Engines

- Type: Type certificate data sheet
- Status: Current
- Holder: Lycoming Engines
- Revision: 22
- Revised: April 30, 2013
- Product: Engine
- Certification basis: CAR 13
- Registered aircraft: 28,834, by the registry models matched to it (OpenAirDocs)
- Data sheet PDF: https://openairdocs.org/files/sha256/1a/ab/1aab617f2278104f284185390843ff1ff3fb8740e1a29536daee4ef08db86758
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/74C397F0D8FA23B886257B63006BA6A4.0001
- Page: https://openairdocs.org/tcds/E-274

## Models (60)

As the data sheet lists them.

- O-320-H3BD
- O-320-D2G
- O-320-E2G
- O-320-D3G
- O-320-C2B
- O-320-E2B
- O-320-E2C
- O-320-D2H
- O-320-B3B
- O-320-H2BD
- O-320-B2D
- O-320-C3A
- O-320-C2A
- O-320-E3H
- O-320-H2AD
- O-320-D2A
- O-320-A1B
- O-320-A2A
- O-320-D2J
- O-320-D1F
- O-320-D1A
- O-320-E2H
- O-320-B3A
- O-320-E3D
- O-320-C1A
- O-320-E1A
- O-320-E2A
- O-320-B2E
- O-320-B2A
- O-320-A3A
- O-320-C3C
- O-320-C2C
- O-320-D1B
- O-320-A3B
- O-320-D2F
- O-320-B2C
- O-320-D2B
- O-320-E1J
- O-320-A2C
- O-320-E2F
- O-320-A1A
- O-320-E1F
- O-320-A2B
- O-320-D2C
- O-320-A3C
- O-320-E1B
- O-320-D1C
- O-320-E2D
- O-320-C1B
- O-320-D1D
- O-320-H3AD
- O-320-B1A
- O-320-B2B
- O-320-E1C
- O-320-B3C
- O-320-A2D
- O-320-C3B
- O-320-B1B
- O-320-H1BD
- O-320-H1AD

## What the data sheet says

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

```text
Page No. 01 02 03 04 05 06 07  
Rev. No. 22 22 16 16 20 14 17  
 
DEPARTMENT OF TRANSPORTATION 
FEDERAL AVIATION ADMINISTRATION 
 
E-274 
Revision 22 
Lycoming Engines 
O-320-A1A, -A1B, -A2A, -A2B, -A2C, -A2D, -A3A, -A3B,   
-A3C, -B1A, -B1B, -B2A, -B2B, -B2C, -B3A, -B3B, B3C,  
-B2D, -B2E -C1A, -C1B, -C2A, -C2B, -C2C, -C3A, -C3B,  
-C3C, -D1A, -D1B, -D1C, -D1D, -D1F, -D2A, -D2B, -D2C,  
-D2F, -D2G, -D2H, -D2J, -D3G, -E1A, -E1B, -E1C, -E1F,  
-E1J, -E2A, -E2B, -E2C, -E2D, -E2F, -E2G, -E2H, -E3D,  
-E3H, -H1AD, -H1BD, -H2AD, -H2BD, -H3AD, -H3BD 
 
April 30, 2013 
 
 
TYPE CERTIFICATE DATA SHEET NO. E-274 
 
Engines of models described herein conforming with this data sheet, (which is part of type certificate No. 274) and other 
approved data on file with the Federal Aviation Administration, meet the minimum standards for use in certificated aircraft in 
accordance with pertinent aircraft data sheets and applicable portions of the Civil Air Regulations/Federal Aviation Regulations 
provided they are installed, operated, and maintained as prescribed by the approved manufacturer's manuals and other approved 
instructions. 
 
Type Certificate Holder Lycoming Engines 
 An Operating Division of AVCO Corporation 
 Williamsport, Pennsylvania 17701 
 
 
 
Type Certificate Holder Record  Textron Lycoming/Subsid iary of Textron, Inc. transferred TC E-274 to Lycoming 
Engines, An Operating Division of AVCO Corporation on December 17, 2003

E-274 Page 2 of 7  
 
Model  
O-320-A1A, -A1B, -A2A, -A2B,  
-A2C, -A2D, -A3A, -A3B, -A3C,  
-C1A, -C1B, -C2A, -C2B, -C2C,  
-C3A, -C3B, -C3C, -E1A, -E1B,  
-E1C, -E1F -E1J, -E2A, -E2B,  
-E2C, -E2D, -E2F, -E2G, -E2H,  
-E3D, -E3H 
 
 
 
 
O-320-H1AD,  
-H1BD, -H2AD,  
-H2BD, -H3AD,  
-H3BD 
O-320-B1A, -B1B,  
-B2A, -B2B, -B2C,  
-B2D, -B3A, -B3B,  
-B3C, -B2E -D1A, 
 -D1B, -D1C, -D1D,  
-D1F, -D2A, -D2B, 
 -D2C, -D2F, -D2G,  
-D2H, -D2J, -D3G 
    
Type 4H0A -  - -  - 
    
Rating    
Max. continuous, h.p. r.p.m. full 
throttle at: 
   
  Sea level pressure altitude 150-2700 160-2700 160-2700 
Takeoff, h.p. r.p.m. full throttle at:    
  Sea level pressure altitude 150-2700 (See NOTE 8) 160-2700  See NOTE 8 160-2700 (See NOTE 8) 
    
Fuel     
(Minimum grade aviation gasoline) 80/87* 100 or 100LL* 91/96* 
Carburetion**  LVC-5-4PA -  - -  - (-B2D,-D1D-  
LHC-6-6BPA) 
Pressure limits See NOTE 2 -  - -  - 
Pump Drive See NOTE 3 -  - -  - 
Oil, Lubrication    
(Lubricants should conform to the Lycoming Specification   
specifications as listed or to  No. 301-F -  - -  - 
subsequent revisions thereto)    
  Oil sump capacity, Qt. 8 6 8 
  Usable oil sump capacity, Qt. 6 4 6 
    
Temperature Limits See NOTE 1 -  - -  - 
Pressure Limits See NOTE 2 -  - -  - 
    
Ignition    
  Dual magnetos See NOTE 9 -  - -  - 
  Timing BTC 25 25 25 
  Spark plugs See NOTE 4 -  - -  - 
    
Compression    
  Bore and stroke, in. 5.125 x 3.875 -  - -  - 
  Displacement,  cu. in. 319.8 -  - -  - 
  Compression ratio 7.00:1 9.00:1 8.50:1 
    
Weight (dry) Lb. See NOTE 9 -  - -  - 
  C.G. location (dry)    
  From face of propeller mounting  
    flange, in. 
14.25             14.57 14.25 14.25           14.70 
  Off propeller shaft C.L., in. .97 Below      .71 Below .97 Below .97 Below    .79 Below 
 .03 Right        .12 Left 
(-E2D, -E3D, -E2H, -E3H) 
.00 (on C.L.) .03 Right      .11 Left 
                    (-B2D, -D1D) 
    
Propeller shaft-specification A.S. 127    
  Integral flanged hub SAE 2 modified -  - -  - 
  Crankshaft dampers (torsional) ⎯ ⎯ ⎯ 
 
* See latest revision of Lycoming Service Instruction 1070 for alternate fuel grades 
** See latest revision of Lycoming Service Instruction 1523 for alternate carburetors. 
 
NOTES: 
"-  -" indicates "same as preceding model." 
"—" indicates "does not apply."

Page 3 of 7 E-274 
 
 
 
Regulations & Amendments 
 
Models 
 
Date of Application 
Date T.C. No. 274 
Issued/Revised 
CAR 13 effective March 5, 1952 O- 320, October 13, 1952 July 28, 1953 
 O-320-A1A   
    
As amended by 13- & 13-2 O-320-A2 A October 21, 1954 October 28, 1954 
    
    
CAR 13 effective June 15, 1956 O-320-B1A, -B2A May 24, 1957 July 25, 1957 
As amended by 13-1 & 13-2 
 
O-320-A1B, -A2B, -A3A, -A3B,  
-B1B, -B2B, -B3A, -B3B 
February 1959 March 23, 1959 
    
13-3 O-320-C2A, -C2B, -C3A, -C3B January 18, 1960 February 11, 1960 
    
 O-320-A2C, -A3C, -B2C, -B3C March 29, 1960 April 27, 1960 
    
13-3 O-320-D1A, -D2A 
O-320-D1B, -D2B 
O-320-E1A, -E2A, -E1B, -E2B 
November 1, 1961 
December 8, 1961 
January 26, 1962 
November 30, 1961 
December 20, 1961 
February 15, 1962 
    
13-4 O-320-C1A, -C1B, -C2C, -C3C 
O-320-E2C 
O-320-D2C 
O-320-E2D 
O-320-E1C 
O-320-E1F, -E2F 
O-320-E2G 
O-320-E3D 
O-320-D1F, -D2F 
O-320-E2H, -E3H 
O-320-D1C 
O-320-A2D 
O-320-D2G 
O-320-D1D 
O-320-E1J 
O-320-H1AD, -H1BD, -H2AD,  
-H2BD 
O-320-H3AD, -H3BD 
O-320-D3G 
O-320-D2H 
O-320-D2J 
January 22, 1963 
November 11, 1965 
April 14, 1966 
December 19, 1966 
May 27, 1969 
July 24, 1970 
December 11, 1970 
January 26, 1971 
February 26, 1971 
July 15, 1971 
September 14, 1971 
March 2, 1972 
March 14, 1974 
March 27, 1974 
January 21, 1975 
September 10, 1975 
 
June 1, 1976 
August 11, 1976 
May 17, 1977 
December 28, 1978 
March 3, 1964 
November 24, 1965 
May 2, 1966 
January 27, 1967 
June 4, 1969 
August 3, 1970 
December 23, 1970 
February 3, 1971 
March 3, 1971 
July 27, 1971 
September 30, 1971 
March 14, 1972 
March 21, 1974 
May 1, 1974 
January 29, 1975 
January 26, 1976 
 
June 4, 1976 
August 23, 1976 
May 20, 1977 
January 4, 1979 
 O-320-B2D June 11, 1992    June 25, 1992 
 O-320-B2E January 30, 2003    July 8, 2003 
    
Production basis Production Certificate No. 3   
 
NOTE 1. Maximum permissible temperatures are as follows: 
 
 Cylinder head 500°F (well-type thermocouple) 
 Cylinder barrel 325°F  
 Oil inlet 245°F 
 
NOTE 2. Fuel pressure limits:  Minimum 0.5 p.s.i. - Maximum 8 p.s.i.  For gravity feed systems, minimum fuel pressure is 
15.0 inches of gasoline differential pressure across the fuel inlet fitting on 0-320-D2J. 
 
 Oil pressure limits: (Normal operation) Minimum 55 p.s.i. - Maximum 95 p.s.i. 
  (Idling) 25 p.s.i. 
  (Starting and warm- up) Maximum 115 p.s.i.

E-274 Page 4 of 7  
NOTE 3. The following accessory drive provisions are available: 
 
O-320 Models 
  
 
 
 
 
 
Accessory 
 
All 
Models 
not 
otherwise 
Shown 
 
 
-H1AD,  
-H1BD, 
-H3AD,  
-H3BD 
-A2D, 
-E2D, 
-E2G,  
-E2H, 
-E3D,  
-E3H 
 
 
 
 
-H2AD, 
-H2BD 
 
 
Rotation 
facing 
Drive  
Pad 
 
 
 
Speed Ratio  
to 
Crankshaft 
 
 
Max. 
Torque  
(in.-lb.) 
Cont. Static 
 
 
Max. 
Overhang 
Moment  
(in.-lb.) 
Starter * * * * CC 13.556:1 —       450 150 
Starter ** ** ** ** CC 16.556:1 —       450 150 
Generator  * — — — C 1.910:1   60     120 175 
Generator ** — — — C 2.500:1   60     120 175 
Alternator — ** — ** C 1.910:1   60     120 175 
Alternator ** * * * C 3.250:1   60     120 175 
Vacuum Pump * — * — CC 1.300:1   70     450 25 
Vacuum Pump — * — ** CC 1.313:1   70     450 25 
Hydraulic Pump — — — — C 1.300:1 100     800 40 
Tachometer * * * * C .500:1     7       50 5 
Prop. governor — — — — C .895:1 125     1200 40 
Prop. governor * — — — C .866:1 125     1200 40 
Fuel Pump (Plunger) ** ** * ** — .500:1 —        — 10 
Fuel Pump ** ** — ** CC 1.000:1   25       450 25 
Optional Dual Drive Mounting on Vacuum Pump Drive Pad    
Vacuum Pump ** — — — CC 1.300:1   70       450 6 
Hydraulic Pump ** — — — CC 1.300:1 Total  Total 10 
or         
Vacuum Pump ** — — — CC 1.300:1   70       450 6 
Vacuum Pump — ** — ** CC 1.313:1   70       450 6 
Prop. Governor ** — — — CC 1.300:1 Total  Total 10 
Prop. Governor — ** — ** C 1.000:1   125   1200 40 
         
"—" Does not apply *Standard  **Optional   "C" Clockwise "CC" Counter Clockwise  
 
 
 
 
 
Accessory 
 
 
-D1C 
-D1D 
 
-D1F 
-E1E 
-E1J 
 
-B2E 
-D2F 
-E2F 
-B2D 
-D2G 
-D2H 
-D3G 
 
 
 
-D2J 
Rotation 
facing 
Drive 
Pad 
 
Speed Ratio 
to  
Crank shaft 
 
Max. Torque  
(in.-lb.) 
Cont. Static 
Max. 
Overhang 
Moment 
(in.-lb.) 
Starter * * * * * CC 13.556:1 —       450 150 
Starter ** ** ** ** ** CC 16.556:1 —       450 150 
Generator  — — — — — C 1.910:1 60       120 175 
Generator — — — — — C 2.500:1 60       120 175 
Alternator — — — — — C 1.910:1 60       120 175 
Alternator * * * * * C 3.250:1 60       120 175 
Vacuum Pump ** ** ** * * CC 1.300:1 70       450 25 
Vacuum Pump — — — — — C 1.910:1 60       120 175 
Hydraulic Pump — * ** — — C 1.300:1 100     800 40 
Tachometer * * * * * C .500:1 7         50 5 
Prop. governor — * — — — C .895:1 125     200 40 
Prop. governor * — — — — C .866:1 125     1200 40 
Fuel Pump (Plunger) * ** * * — — .500:1 —       — 10 
Fuel Pump — — — — — CC 1.000:1 25       450 25 
Optional Dual Drive Mounting on Vacuum Pump Drive Pad 
Vacuum Pump ** — — ** ** CC 1.300:1 70       450 6 
Hydraulic Pump ** — — ** ** CC 1.300:1 Total  Total 10 
or          
Vacuum Pump ** — — ** ** CC 1.300:1 70       450 6 
Vacuum Pump — — — — — CC 1.313:1 70       450 6 
Prop. Governor ** — — — ** CC 1.300:1 Total  Total 10 
Prop. Governor — — — — — C 1.000:1 125     1200 40 
          
"—" Does not apply  *Standard  **Optional  "C" Clockwise  "CC" Counter clockwise

Page 5 of 7 E-274 
 
NOTE 4. Spark plugs approved for use on these engines are listed in the latest revision of Lycoming Service Instruction No. 
1042. 
 
 
NOTE 5. The above models incorporate additional characteristics as follows: 
 
O-320 Models  Characteristics 
O-320 Basic model - four cylinder, horizonta lly opposed air cooled, direct drive with 
automotive type generator and starter, provides for single acting controllable pitch  
propeller. 
  
O-320-A1A Same as O-320, mode l designation change only. 
  
O-320-B1A Same as O-320-A1A except for co mpression ratio, fuel grade and rating. 
  
O-320-A1B, -B1B Same as O-320-A1A and -B1A respec tively except have straight bore carburetor riser. 
  
O-320-A2A, -A2B, 
and -B2A, -B2B 
Same as O-320-A1A, -A1B, -B1A and B1B respectively except have no provisions for 
controllable pitch  propellers. 
  
O-320-A2D Same as O-320-E3D except crankcase m achined for  conical instead of Dynafocal 
mounts. 
  
O-320-A3A, -A3B, 
-B3A, and -B3B  
Same as O-320-A1A, -A1B, -B1A, and -B1B  respectively except have provisions for 
7/16" propeller attaching bolts. 
  
O-320-A2C, -A3C Same as O-320-A2B and -A 3B respectively, except for magnetos. 
  
O-320-B2C, -B3C Same as O-320-B2B and -B 3B respectively, except for magnetos. 
  
O-320-B2D Same as O-320-D1D except coni cal engine mounts and no prop governor 
  
O-320-B2E Similar to –B2B except carburet or located same as O-320-D models 
  
O-320-C2A, -C2B, 
-C3A, -C3B 
Same as O-320-B2A, -B2B, -B3A and B3B respectively, except have O-320-A series, 
low compression pistons, reduced ratings and lower grade fuel requirements. 
  
O-320-C1A, -C1B,  
-C2C, -C3C 
Same as O-320-B1A, -B1B, -B2C, -B3C respectively, except have been converted to low 
compression pistons. 
  
O-320-D1A Same as O-320-B3B except ha s provisions for dynafocal mounts. 
  
O-320-D1B, -D2B Same as O-320-D1A and -D2A receptively, except for magnetos. 
  
O-320-D1C Identical to O-320-D2C except has provision for controllable pitch propellers. 
  
O-320-D1D Similar to O-320-D1A except incorporates  Slick instead of Bendix magnetos and has a 
horizontal carburetor and induction housing 
  
O-320-D1F Identical to O-320-E1F except is equippe d with high compression pistons and has higher 
H.P. rating. 
  
O-320-D2A Same as O-320-D1A except has no pr ovisions for controllable pitch propellers 
  
O-320-D2C Similar to model O-320-D2A except for magnetos. 
  
O-320-D2F Similar to O-320-D1F but does not have  provisions for controllable pitch propeller. 
  
O-320-D2G Identical to O-320-D2A except incorporat es Slick instead of Bendix magnetos and 7/16 
instead of 3/8 prop. flange bolts.

E-274 Page 6 of 7  
 
O-320 Models  Characteristics 
O-320-D2H Same as D2G except has O-320-B sump and intake pipes and provision for AC type fuel 
pump. 
  
O-320-D2J Similar to O-320-D2G except is equipped with two Slick impulse coupling magnetos and 
the prop. governor pad, fuel pump and governor pads on accessory housing are not 
machined. 
  
O-320-D3G Same as D2G except has 3/8 in prop. attaching bolts. 
  
O-320-E1A, -E2A Same as O-320-D1A and -D2A resp ectively, except have lower compression ratio and 
performance. 
  
O-320-E1B, -E2B Same as O-320-E1A and -E2A respectively except for magnetos. 
  
O-320-E1C, -E2C Same as O-320-E1A and -E2A respectively except have 1200 series magnetos. 
  
O-320-E1F Similar to O-320-E1C except has propeller governor drive located on left front of 
crankcase instead of on the accessory housing. 
  
O-320-E1J Same as O-320-E1F except is  equipped with Slick magnetos. 
  
O-320-E2D Similar to O-320-E2A except has no pr ovisions for controllable pitch propeller. 
  
O-320-E2F Identical to O-320-E1F including provisi ons for propeller governing but does not contain 
propeller governor drive gears. 
  
O-320-E2G Similar to O-320-E2D except is equipped with O-320-A series sump and intake pipes. 
  
O-320-E2H Identical to O-320-E2D except incorporates Bendix instead of Slick magnetos. 
  
O-320-E3D Identical to O-320-E2D except has provisi ons for .375 in. propeller flange bolts instead 
of .4375 in. flange bolts. 
  
O-320-E3H Identical to O-320-E2H except has .375 in . propeller flange bushings instead of .4375 in. 
flange bushings. 
  
O-320-H1AD Integral accessory section crankcase, front mounted fuel pump external mounted oil 
pump and D4RN-2O21 impulse coupling dual magneto. 
  
O-320-H2AD Same as -H1AD but with fixed pitch propeller. 
  
O-320-H3AD Same as -H2AD but with 3/8 in. instead of 7/16 in. propeller flange bolts. 
  
O-320-H1BD  Same as -H1AD but with D4RN-2200 retard breaker dual magneto. 
  
O-320-H2BD Same as -H2AD but with D4RN-2200 retard breaker dual magneto. 
  
O-320-H3BD Same as -H3AD but with D4RN-2200 retard breaker magneto. 
 
NOTE 6. These engines incorporate provisions for absorbing pr opeller thrust in both tractor and pusher type installations. 
 
NOTE 7. These engines are approved for horiz ontal helicopter application and operation. 
 
NOTE 8. The O-320-E2A and -E2C have alternate rating of 140 hp. @ 2450 r.p.m., the O-320-D series have alternate ratings 
of 150 hp at 2500 r.p.m. and 155 hp. at 2600 r.p.m.; the O-320-H series have an alternate rating of 150 h.p. at 2600 
r.p.m.

Page 7 of 7 E-274 
 
NOTE 9. O-320- Weight (dry) and ignition, dual. 
 
 
 
Models Weight Lb. Magnetos * 
-A1A, -A1B, -A2A-A2B, -A3A, -A3B 244 S4LN21, S4LN20  ( TCM)+ 
   
-A2D 249 4251, 4250 (Slick) 
   
-A2C, -A3C  243 S4LN-200, S4LN-204 ( TCM)  
-B1A, -B1B, -B2A 250 S4LN-21, S4LN-20 ( TCM) 
-B2B, -B3A, -B3B 250 S4LN-21, S4LN-20 ( TCM) 
-B2C, -B3C  249 S4LN-200, S4LN-204 ( TCM) 
-B2D 283 4373, 4370 (Slick) 
-B2E 250 4373, 4370 (Slick) 
-C1A, -C1B, -C2A 250 S4LN-21, S4LN-20 ( TCM) 
-C2B, -C3A, -C3B 250 S4LN-21, S4LN-20 ( TCM) 
-C2C, -C3C  249 S4LN-200, S4LN-204 ( TCM) 
-D1A, -D2A 255 S4LN-21, S4LN-20 ( TCM) 
-D1B, -D2B  254 S4LN-200, S4LN-204 ( TCM) 
-D1C, -D2C  256 24LN-1227, SRLN-1209 ( TCM) 
-D1D 253 4251, 4250 (Slick) 
-D1F, -D2F  255 S4LN-1227, S4LN-1209 ( TCM) 
-D2G 251 4251, 4250 (Slick) 
-E1A, -E2A 244 S4LN-21, S4LN-20, S4LN-204 ( TCM) 
-E1B, -E2B 243 S4LN-200, S4LN-204 ( TCM) 
-E1C, -E2C 245 S4LN-1227, S4LN-1209 ( TCM) 
-E1F, -E2F 248 S4LN-1227, S4LN-1209 ( TCM) 
-E2D 249 4251, 4250 (Slick) 
-E2G 249 4251, 4250 (Slick) 
-E2H 252 S4LN-21, SRLN-20 ( TCM) 
-E3D 249 4250, 4251 (Slick) 
-E3H 252 S4LN-21, S4LN-20 ( TCM) 
-E1J 245 4251, 4250 (Slick) 
-D2H 251 4251, 4250 (Slick) 
-D2J 255 (2) 4251 (Slick) 
-D3G 251 4251, 4250 (Slick) 
-H1AD 253 D4RN-2021 ( TCM) 
-H2AD 253 D4RN-2021( TCM) 
-H3AD 253 D4RN-2021 ( TCM) 
-H1BD 253 D4RN-2200 ( TCM) 
-H2BD 253 D4RN-2200 ( TCM) 
-H3BD 253 D4RN-2200 ( TCM) 
 
* For alternate magnetos see latest revision of Lycoming Service Instruction 1443 
+ TCM formally Bendix 
 
 
NOTE 10. All models equipped with one impulse coupling magneto may use two impulse coupling magnetos as optional 
equipment.  Starters, generators and alternators approved for use on the engines are listed in the latest revision of 
Lycoming Service Instruction No. 1154. 
 
 
 
 
----END----
```

## ADs (44, in force first)

- [AD 2026-04-11](https://openairdocs.org/ad/2026-04-11): Engine (Reciprocating) · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 605 more. Effective Apr 8, 2026
- [AD 2022-16-03](https://openairdocs.org/ad/2022-16-03): Engine (RECIPROCATING) · Continental Aerospace Technologies GTSIO-520-C, GTSIO-520-D, GTSIO-520-F and 236 more. Effective Aug 15, 2022
- [AD 2017-16-11](https://openairdocs.org/ad/2017-16-11): Reciprocating Engine Power Section · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-360-B1G6 and 93 more. Effective Aug 15, 2017
- [AD 2012-03-07](https://openairdocs.org/ad/2012-03-07): Carburetor · Lycoming Engines GO-435, GO-435-C2 (O-435-17), GO-435-C2A and 389 more. Effective Mar 27, 2012
- [AD 2010-07-08](https://openairdocs.org/ad/2010-07-08): Turbochargers · Kelly Aerospace Energy Systems HIO-360-E1AD, HIO-360-E1BD, HIO-360-F1AD and 137 more. Effective Apr 19, 2010
- [AD 2009-26-12](https://openairdocs.org/ad/2009-26-12): Cylinder assemblies · Engine Components Reciprocating Engine Cylinder Assemblies, AEIO-320-D1B, AEIO-320-D2B and 264 more. Effective Feb 4, 2010
- [AD 2007-04-19 R1](https://openairdocs.org/ad/2007-04-19-R1): SAP cylinder assemblies · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 314 more. Effective May 7, 2007
- [AD 2006-12-07](https://openairdocs.org/ad/2006-12-07): ECi cylinder assemblies · Aerostar AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 386 more. Effective Jul 11, 2006
- [AD 2004-10-14](https://openairdocs.org/ad/2004-10-14): Crankshaft gear · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 642 more. Effective Jun 25, 2004
- [AD 2002-12-07](https://openairdocs.org/ad/2002-12-07): Oil Filter Converter Plate Gasket or the Converter Plate Kit · Lycoming Engines HIO-360-E1AD, HIO-360-E1BD, HIO-360-F1AD and 95 more. Effective Jul 3, 2002
- [AD 98-17-11](https://openairdocs.org/ad/98-17-11): Crankshafts · Continental Motors A-65-3, A-65-8, A75-8 and 90 more. Effective Oct 19, 1998
- [AD 98-02-08](https://openairdocs.org/ad/98-02-08): Crankshaft · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 216 more. Effective Mar 30, 1998
- [AD 98-01-06](https://openairdocs.org/ad/98-01-06): Carburetors · Continental Motors A-65-1, A-65-12, A-65-12F and 184 more. Effective Feb 13, 1998
- [AD 97-15-11](https://openairdocs.org/ad/97-15-11): Cylinder kits · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 538 more. Effective Aug 12, 1997
- [AD 96-09-10](https://openairdocs.org/ad/96-09-10): Oil pump · Lycoming Engines AEIO-320-E1A, AEIO-320-E1B, AEIO-320-E2A and 334 more. Effective Jul 15, 1996
- [AD 95-26-02](https://openairdocs.org/ad/95-26-02): Aviation Gasoline · Lycoming Engines IO-320-B1A, IO-320-B1B, IO-320-B1C and 182 more. Effective Jan 24, 1996
- [AD 93-19-04](https://openairdocs.org/ad/93-19-04): Carburetors · Continental Motors A-65-1, A-65-12, A-65-12F and 184 more. Effective Oct 18, 1993
- [AD 92-12-05](https://openairdocs.org/ad/92-12-05): Piston Pins · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 532 more. Effective Jul 10, 1992
- [AD 90-04-06 R1](https://openairdocs.org/ad/90-04-06-R1): Propeller Governor External Oil Line · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 427 more. Effective May 28, 1991
- [AD 87-10-06 R1](https://openairdocs.org/ad/87-10-06-R1): Rocker Arm Assembly · Lycoming Engines IO-360-B4, IVO-360-A1A, O-340-A1A and 243 more. Effective Sep 1, 1989
- [AD 80-04-03 R2](https://openairdocs.org/ad/80-04-03-R2): Hydraulic Lifter · Lycoming Engines LO-360-E1A6D, LTO-360-E1A6D, O-320-H1AD and 7 more. Effective Apr 25, 1988
- [AD 81-16-05](https://openairdocs.org/ad/81-16-05): Magnetos · Lycoming Engines AEIO-320-E1B, AEIO-320-E2B, AEIO-360-B1G6 and 234 more. Effective Aug 6, 1981
- [AD 80-14-07](https://openairdocs.org/ad/80-14-07): Upper Exhaust Valve Spring Seats · Lycoming Engines LO-360-E1A6D, O-320-H1AD, O-320-H1BD and 5 more. Effective Jul 7, 1980
- [AD 79-10-03 R2](https://openairdocs.org/ad/79-10-03-R2): Engine Mounting Bracket Attaching Bolts · Lycoming Engines LO-360-E1A6D, O-320-H2AD and O-360-E1A6D. Effective Jul 1, 1980
- [AD 80-06-05](https://openairdocs.org/ad/80-06-05): Magnetos · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 254 more. Effective Mar 28, 1980
- [AD 77-07-07](https://openairdocs.org/ad/77-07-07): Oil Level Gage · Lycoming Engines O-320-H2AD. Effective Feb 20, 1979
- [AD 78-12-09](https://openairdocs.org/ad/78-12-09): Crankshaft Gear Assembly · Lycoming Engines O-320-H1AD, O-320-H1BD, O-320-H2AD and 3 more. Effective Feb 20, 1979
- [AD 77-20-07](https://openairdocs.org/ad/77-20-07): Loose Rocker Arm Retaining Studs and Hydraulic Tappets · Lycoming Engines O-320-H1AD, O-320-H1BD, O-320-H2AD and 3 more. Effective Aug 31, 1978
- [AD 78-12-08](https://openairdocs.org/ad/78-12-08): Oil Pump Body · Lycoming Engines O-320-H1AD, O-320-H1BD, O-320-H2AD and 3 more. Effective Jun 20, 1978
- [AD 75-08-09](https://openairdocs.org/ad/75-08-09): Oil Pump Drive Shaft · Lycoming Engines AEIO-360-A1B, AEIO-360-A1B6, AEIO-360-A1C and 365 more. Effective Aug 18, 1977
- [AD 73-23-01](https://openairdocs.org/ad/73-23-01): Piston Pin Assembly · Lycoming Engines AIO-360-A1A, AIO-360-A1B, AIO-360-A2A and 215 more. Effective Jan 13, 1977
- [AD 69-24-03](https://openairdocs.org/ad/69-24-03): Carburetors · Continental Motors A-65-1, A-65-12, A-65-12F and 321 more. Effective Nov 29, 1969
- [AD 66-06-03](https://openairdocs.org/ad/66-06-03): Connecting Rod Assemblies · Lycoming Engines GO-435-C2 (O-435-17), GO-435-C2A, GO-435-C2A2 and 317 more. Effective Jan 16, 1969
- [AD 63-23-02](https://openairdocs.org/ad/63-23-02): Exhaust Valves · Lycoming Engines O-320-A1A, O-320-A1B, O-320-A2A and 25 more. Effective Aug 6, 1968
- [AD 67-01-04](https://openairdocs.org/ad/67-01-04): Oil Filters · Full flow oil filter (Superior Flow STC SA401SW or 2 others). Effective Jan 2, 1967
- [AD 66-20-04](https://openairdocs.org/ad/66-20-04): Oil Filter Adapter Gasket · Lycoming Engines IO-320-A1A, IO-320-A2A, IO-320-B1A and 121 more. Effective Aug 27, 1966
- [AD 64-16-05](https://openairdocs.org/ad/64-16-05): AC Pumps · Lycoming Engines HIO-360-B1A, HIO-360-B1B, IO-320-B1A and 86 more. Effective Jul 10, 1964
- [AD 55-02-02](https://openairdocs.org/ad/55-02-02): Gasket · Lycoming Engines O-320-A1A and O-320-A2A
- [AD 59-10-07](https://openairdocs.org/ad/59-10-07): Cylinder Baffle Clamps · Lycoming Engines GO-480-A1A, GO-480-B, GO-480-B1A6 and 58 more
- [AD 2024-21-02](https://openairdocs.org/ad/2024-21-02) (historical): Engine (Reciprocating) · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 548 more. Effective Dec 5, 2024
- [AD 2008-19-05](https://openairdocs.org/ad/2008-19-05) (historical): Parallel Valve'' reciprocating engines · Engine Components Reciprocating Engine Cylinder Assemblies, AEIO-320-D1B, AEIO-320-D2B and 262 more. Effective Oct 20, 2008
- [AD 2005-26-10](https://openairdocs.org/ad/2005-26-10) (historical): ECi cylinder assemblies. · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 413 more. Effective Jan 31, 2006
- [AD 81-18-04 R2](https://openairdocs.org/ad/81-18-04-R2) (historical): Engine Oil Pump Driven Impeller and Shaft · Textron Lycoming, AVCO AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 376 more. Effective Jun 7, 1982
- [AD 2000-18-53](https://openairdocs.org/ad/2000-18-53) (historical): Oil Filter Converter Plate Gaskets · Textron Lycoming, AVCO AEIO-540, IO-360-A1B6D, IO-360-A1D6D and 73 more

## Registered aircraft by registry model (OpenAirDocs)

- [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series): 27,057 aircraft (registry code 41508)
- [Lycoming O-320-E2D](https://openairdocs.org/engine/lycoming-o-320-e2d): 258 aircraft (registry code 42123)
- [Lycoming O-320 series](https://openairdocs.org/engine/lycoming-o-320-series): 256 aircraft (registry code 42389)
- [Lycoming O-320-A2B](https://openairdocs.org/engine/lycoming-o-320-a2b): 180 aircraft (registry code 42101)
- [Lycoming O-320-D3G](https://openairdocs.org/engine/lycoming-o-320-d3g): 134 aircraft (registry code 42156)
- [Lycoming O-320-D1A](https://openairdocs.org/engine/lycoming-o-320-d1a): 116 aircraft (registry code 42145)
- [Lycoming O-320-E2A](https://openairdocs.org/engine/lycoming-o-320-e2a): 98 aircraft (registry code 42120)
- [Lycoming O-320-D2J](https://openairdocs.org/engine/lycoming-o-320-d2j): 96 aircraft (registry code 41595)
- [Lycoming O-320-B2B](https://openairdocs.org/engine/lycoming-o-320-b2b): 92 aircraft (registry code 42138)
- [Lycoming O-320-H2AD](https://openairdocs.org/engine/lycoming-o-320-h2ad): 83 aircraft (registry code 42131)
- [Lycoming O-320-D2A](https://openairdocs.org/engine/lycoming-o-320-d2a): 72 aircraft (registry code 42150)
- [Lycoming O-320-E3D](https://openairdocs.org/engine/lycoming-o-320-e3d): 65 aircraft (registry code 42127)
- [Lycoming O-320-B2C](https://openairdocs.org/engine/lycoming-o-320-b2c): 55 aircraft (registry code 42139)
- [Lycoming O-320-E2G](https://openairdocs.org/engine/lycoming-o-320-e2g): 28 aircraft (registry code 42125)
- [Lycoming O-320-B3B](https://openairdocs.org/engine/lycoming-o-320-b3b): 22 aircraft (registry code 42142)
- [Lycoming O-320-A1A](https://openairdocs.org/engine/lycoming-o-320-a1a): 21 aircraft (registry code 42098)
- [Lycoming O-320-D2G](https://openairdocs.org/engine/lycoming-o-320-d2g): 21 aircraft (registry code 42154)
- [Lycoming O-320-D2B](https://openairdocs.org/engine/lycoming-o-320-d2b): 18 aircraft (registry code 42151)
- [Lycoming O-320-B1A](https://openairdocs.org/engine/lycoming-o-320-b1a): 17 aircraft (registry code 42135)
- [Lycoming 0320-E3D](https://openairdocs.org/engine/lycoming-0320-e3d): 13 aircraft (registry code 42398)
- [Lycoming O-320-A2D](https://openairdocs.org/engine/lycoming-o-320-a2d): 13 aircraft (registry code 42103)
- [Lycoming O-320-A3B](https://openairdocs.org/engine/lycoming-o-320-a3b): 12 aircraft (registry code 42105)
- [Lycoming O-320-B2A](https://openairdocs.org/engine/lycoming-o-320-b2a): 11 aircraft (registry code 42137)
- [Lycoming O-320-E2C](https://openairdocs.org/engine/lycoming-o-320-e2c): 11 aircraft (registry code 42122)
- [Aerosport O-320-D1A](https://openairdocs.org/engine/aerosport-o-320-d1a): 10 aircraft (registry code 01302)
- [Lycoming O-320-A](https://openairdocs.org/engine/lycoming-o-320-a-series): 10 aircraft (registry code 42395)
- [Lycoming 0-320-A2A](https://openairdocs.org/engine/lycoming-0-320-a2a): 9 aircraft (registry code 42100)
- [Lycoming O-320-D1F](https://openairdocs.org/engine/lycoming-o-320-d1f): 7 aircraft (registry code 42149)
- [Lycoming 0-320-E2G](https://openairdocs.org/engine/lycoming-0-320-e2g): 5 aircraft (registry code 42400)
- [Lycoming O-320-A3A](https://openairdocs.org/engine/lycoming-o-320-a3a): 5 aircraft (registry code 42104)
- [Lycoming O-320-E1F](https://openairdocs.org/engine/lycoming-o-320-e1f): 5 aircraft (registry code 42118)
- [Lycoming O-320-D1D](https://openairdocs.org/engine/lycoming-o-320-d1d): 4 aircraft (registry code 42148)
- [Lycoming O-320-E2B](https://openairdocs.org/engine/lycoming-o-320-e2b): 4 aircraft (registry code 42121)
- [Lycoming O-320-B1B](https://openairdocs.org/engine/lycoming-o-320-b1b): 3 aircraft (registry code 42136)
- [Lycoming O-320-E1A](https://openairdocs.org/engine/lycoming-o-320-e1a): 3 aircraft (registry code 42115)
- [Superior 0-320-D1A](https://openairdocs.org/engine/superior-0-320-d1a): 3 aircraft (registry code 59201)
- [Aerotec O-320](https://openairdocs.org/engine/aerotec-o-320-series): 2 aircraft (registry code 63203)
- [Lycoming O-320-A1B](https://openairdocs.org/engine/lycoming-o-320-a1b): 2 aircraft (registry code 42099)
- [Lycoming O-320-B2D](https://openairdocs.org/engine/lycoming-o-320-b2d): 2 aircraft (registry code 42140)
- [Lycoming O-320-C2A](https://openairdocs.org/engine/lycoming-o-320-c2a): 2 aircraft (registry codes 42109, 42402)
- [Lycoming O-320-E3H](https://openairdocs.org/engine/lycoming-o-320-e3h): 2 aircraft (registry code 42128)
- [Lycoming O-320-A2C](https://openairdocs.org/engine/lycoming-o-320-a2c): 1 aircraft (registry code 42102)
- [Lycoming O-320-A3C](https://openairdocs.org/engine/lycoming-o-320-a3c): 1 aircraft (registry code 42106)
- [Lycoming O-320-B2E](https://openairdocs.org/engine/lycoming-o-320-b2e): 1 aircraft (registry code 42144)
- [Lycoming O-320-C1A](https://openairdocs.org/engine/lycoming-o-320-c1a): 1 aircraft (registry code 42107)
- [Lycoming O-320-C3B](https://openairdocs.org/engine/lycoming-o-320-c3b): 1 aircraft (registry code 42113)
- [Lycoming O-320-D2](https://openairdocs.org/engine/lycoming-o-320-d2-series): 1 aircraft (registry code 42393)
- [Lycoming O-320-D2C](https://openairdocs.org/engine/lycoming-o-320-d2c): 1 aircraft (registry code 42152)
- [Lycoming O-320-B3A](https://openairdocs.org/engine/lycoming-o-320-b3a): 0 aircraft (registry code 42141)
- [Lycoming O-320-B3C](https://openairdocs.org/engine/lycoming-o-320-b3c): 0 aircraft (registry code 42143)

All 69: https://openairdocs.org/tcds/E-274/aircraft.md

## STCs approved under this data sheet (70, first 50)

- [STC SE04651CH](https://openairdocs.org/stc/SE04651CH): To allow use of l00R grade aviation fuel meeting Swift Fuel, LLC specification SPEC-l00R-22. Swift Fuels LLC
- [STC SE00825WI](https://openairdocs.org/stc/SE00825WI): Installation of Specialty Products Spin-on oil filter on Lycoming Engines.. B & C Specialty Products Inc.
- [STC SE2932SW](https://openairdocs.org/stc/SE2932SW): Install carburetor air temperature indicator. Approved for Aircooled Motors (Franklin Engine Co.) equipped with float carburetors. Model eligibility included here may not be inclusive.. Alcor LLC
- [STC SE208SO](https://openairdocs.org/stc/SE208SO): Installation of ice indicator in the carburetor.. LegacySTC.com
- [STC SE04349CH](https://openairdocs.org/stc/SE04349CH): Installation of SureFly electronic ignition. SureFly Partners Ltd.
- [STC SE01954SE](https://openairdocs.org/stc/SE01954SE): Installation of engine crankcase seal.. Ly-Con Rebuilding Company
- [STC SE02352CH](https://openairdocs.org/stc/SE02352CH): Installation of Challenger cleanable oil filter assembly. Challenger Aviation Products Inc.
- [STC SE00939WI](https://openairdocs.org/stc/SE00939WI): Installation of B&C Specialty Products Model BC 315-( ) Starter on Lycoming engines.. B & C Specialty Products Inc.
- [STC SE2391CE](https://openairdocs.org/stc/SE2391CE): Installation of B&C Speciality Products lightweight (10.2 pounds) engine starter, part number BC-315-100-1 (12 volts)
or part number BC-315-100-3 (24 volts) on engines with ring gears that have 122 teeth. B & C Specialty Products Inc.
- [STC SE03232CH](https://openairdocs.org/stc/SE03232CH): Installation of Engine Preheat Kit p/n TA2925-1 for 115 volt application. Hartzell Propeller Inc.
- [STC SE4-1638](https://openairdocs.org/stc/SE4-1638): Installation of one Roto-Master Turbocharger Model No. 3DT5FF10J2, P/N 600572-00 (formerly Rajay Model No. 315F10, P/N RJ0080-100, -101, or -102).. TALCO Aviation
- [STC SE04577CH](https://openairdocs.org/stc/SE04577CH): Install an electronic engine ignition system. Electroair Acquisition Corp
- [STC SE01966WI](https://openairdocs.org/stc/SE01966WI): Use of GAMI G100UL High Octane Unleaded Avgas in spark ignition piston aircraft engines. General Aviation Modifications Inc.
- [STC SE8628SW](https://openairdocs.org/stc/SE8628SW): Installation of oil nozzles for lubrication of cam and filters.. Cygnet Aerospace Corp
- [STC SE03215CH](https://openairdocs.org/stc/SE03215CH): STC for the conversion of Lycoming O-320-A, B, C, D, E; IO-320-A, B, C, D, E, F; AIO-320-A, B; AEIO-320-D, E to increase engine displacement to 340 cubic inches by installation of a crankshaft with a longer stroke. Continental Motors, Inc.
- [STC SE1051SW](https://openairdocs.org/stc/SE1051SW): Convert straight mount engine to dynafocal mount configuration. Continental Motors, Inc.
- [STC SE1339SW](https://openairdocs.org/stc/SE1339SW): Modify pistons to Drawings 11007 and 11015; piston rings. Continental Motors, Inc.
- [STC SE4408SW](https://openairdocs.org/stc/SE4408SW): Miscellaneous engine cylinder replacement parts.. Continental Motors, Inc.
- [STC SE8776SW](https://openairdocs.org/stc/SE8776SW): Installation of coated cylinders and piston rings.. Continental Motors, Inc.
- [STC SE00218NY](https://openairdocs.org/stc/SE00218NY): Replacement of Lycoming starter with SKY-TEC 12 volt starter installed.. Hartzell Engine Technologies, LLC
- [STC SE00226NY](https://openairdocs.org/stc/SE00226NY): Replacement of Lycoming starter with SKY-TEC 24-volt starter Models 149-24HT and 122-24HT. Approval limited to 24-volt DC source available to the starter.. Hartzell Engine Technologies, LLC
- [STC SE00357NY](https://openairdocs.org/stc/SE00357NY): Replacement of Lycoming starter with SKY-TEC 24-volt starter installed.. Hartzell Engine Technologies, LLC
- [STC SE2901NM](https://openairdocs.org/stc/SE2901NM): Lycoming valve cover gasket. Real Gaskets Tennessee
- [STC SE00590DE](https://openairdocs.org/stc/SE00590DE): Installation of modified Lubricated Camshaft. Centri-Lube Technologies LLC
- [STC SE01524CH](https://openairdocs.org/stc/SE01524CH): Replace Slick 6000, 6100, 6200, 6300, 4000, 4100, 4200, and 4300 series magnetos and TCM/Bendix S6-20, S6-200, S6-1200, S-20, S-200, and S-1200 series magnetos with Champion Limited Authority Spark Advance Regulator (LASAR ) Model 4755 and 6755 bush kit ignition systems.. Champion Aerospace LLC
- [STC SE419CH](https://openairdocs.org/stc/SE419CH): Replace Slick 4000, 4100, 4200, and 4300 series magnetos and TCM/Bendix S-20, S-200, and S-1200 series magnetos with the Champion Limited Authority Spark Advance Regulator (LASAR ) ignition system. Champion Aerospace LLC
- [STC SE524CH](https://openairdocs.org/stc/SE524CH): Replace Slick 4000, 4100, 4200, and 4300 series magnetos and TCM/Bendix S-20, S-200, and S-1200 series magnetos with the Champion Limited Authority Spark Advance Regulator (LASAR ). Champion Aerospace LLC
- [STC SE862GL](https://openairdocs.org/stc/SE862GL): Replacement of Bendix S4LN-20, -21, -1209, or -1227 model magnetos with Slick model4250 or 4251 magnetos.. Champion Aerospace LLC
- [STC SE3692SW-D](https://openairdocs.org/stc/SE3692SW-D): Increase 5 minute takeoff maximum power rating to 160 horsepower.. RAM Aircraft Limited Partnership
- [STC SE8193SW](https://openairdocs.org/stc/SE8193SW): Grind nitriden high compression cylinder barrles to plus .010 oversize and install SL75089 P10 piston, SL74242 P10 compression ring, and SL73857 P10 oil ring.. Superior Air Parts Inc.
- [STC SE1931CE](https://openairdocs.org/stc/SE1931CE): Add the following approved fuel: unleaded automotive gasoline, 87 minimum antiknock index and leaded automotive gasoline, 88 minimum antiknock index, (RON+MON)/2.. Petersen Aviation Inc
- [STC SE2587CE](https://openairdocs.org/stc/SE2587CE): Add unleaded and leaded automotive gasoline, 91 minimum antiknock index per ASTM specification D-439.. Petersen Aviation Inc
- [STC SE8987SW](https://openairdocs.org/stc/SE8987SW): Modify engine IAW RAM Aircraft Corp Drawing No. 1724. Minimum fuel grade is 100/100LL.. RAM Aircraft Limited Partnership
- [STC SE925GL](https://openairdocs.org/stc/SE925GL): Installation of Shadin Co. fuel flow transducer.. Shadin Company Inc
- [STC SE01930NY](https://openairdocs.org/stc/SE01930NY): Installation of Casper Labs 90 degree oil filter housing adapter.. Casper Labs Inc
- [STC SE02157NY](https://openairdocs.org/stc/SE02157NY): Installation  and maintenance of new roller-bearing lifters and camshaft.. Air P Techno Inc
- [STC SE1779NM](https://openairdocs.org/stc/SE1779NM): Installation of Precise Flight, Inc. Standby Vacuum System SVS III. Precise Flight Inc
- [STC SE02207AK](https://openairdocs.org/stc/SE02207AK): Limited to installation on model O-320-E2D, serial number 24305-27A ONLY.. Hot Springs Aviation
- [STC SE5743NM](https://openairdocs.org/stc/SE5743NM): Intallation of adapter for externally mounted oil filter.. Aviation Development Corporation
- [STC SE2315NM](https://openairdocs.org/stc/SE2315NM): Modification of Lycoming 0-320-A2B engine to 160 HP configuration.. Aero Recip Alaska, LLC
- [STC SE1-201](https://openairdocs.org/stc/SE1-201): Installation of the Richter Aero Equipment Type B-4 or B-5 Temperature Probe. (O-360 SERIES (excl. A1C, C2B, C2D)). MidContinent Instru Co Inc
- [STC SE682NE](https://openairdocs.org/stc/SE682NE): Conversion of Model 0-320-E2G engine to high compression.. Precision Engine
- [STC SE09492SC](https://openairdocs.org/stc/SE09492SC): Installation and usage of Exxon 20W50 multigrade aircraft engine oil conforming to Exxon Oil formulation WS-3013.. Exxon Company USA
- [STC SE00590LA](https://openairdocs.org/stc/SE00590LA): Installation of Nickson's cylinder barrels on Lycoming reciprocating engine models.. Nickson's Machine Shop Inc
- [STC SE00350SE](https://openairdocs.org/stc/SE00350SE): Installation of sump mounted chip detector.. Aviation Development Corporation
- [STC SE1226CE](https://openairdocs.org/stc/SE1226CE): Modify engines for a 160 horsepower rating on 100/130 minimum grade fuel.. Ly-Con Rebuilding Company
- [STC SE00252SE](https://openairdocs.org/stc/SE00252SE): Modification for a 160 hp rating on 100/100LL minimum grade fuel.. Ly-Con Rebuilding Company
- [STC SE8023SW](https://openairdocs.org/stc/SE8023SW): Installation and usage of AEROSHELL. Shell Development Co
- [STC SE702NE](https://openairdocs.org/stc/SE702NE): Modification of crankcase tappet bores to accommodate large tappets.. Mattituck Airbase, Inc
- [STC SE4634NM](https://openairdocs.org/stc/SE4634NM): Installation of oil filter adapter fabricated.. Univ of Alaska Fairbanks

All 70: https://openairdocs.org/tcds/E-274/stcs.md

---
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