# TCDS E-243: Curtiss-Wright/Marquette Inc.

- Type: Type certificate data sheet
- Status: Current
- Holder: Curtiss-Wright/Marquette Inc.
- Revision: 7
- Revised: December 28, 1983
- Product: Engine
- Data sheet PDF: https://openairdocs.org/files/sha256/fa/62/fa62767586cf52d7430244d6d247b2578bf0094a502b92496274b0dc870a54ea
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E9720A2DECA79D1F8525670B006C599C.0001
- Page: https://openairdocs.org/tcds/E-243

## Models (14)

As the data sheet lists them.

- Cyclone 737C9HD1
- Cyclone 740C9HD2
- Cyclone 737C9HD4
- Cyclone 736C9HD2
- Cyclone 736C9HD3
- Cyclone 736C9HD1
- Cyclone 737C9HD2
- Cyclone 977C9HD2
- Cyclone 977C9HD1
- Cyclone 977C9HD3
- Cyclone 987C9HD1
- Cyclone 736C9HD4
- Cyclone 740C9HD1
- Cyclone 737C9HD3

## 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. 1 2 3
Rev. No. 7 7 7
Reformatted 10/94
DEPARTMENT OF TRANSPORTATION
FEDERAL AVIATION ADMINISTRATION
E-243-7
WRIGHT
Cyclone 736C9HD1,2,3,4
737C9HD1,2,3,4
740C9HD1,2
977C9HD1,2,3
989C9HD1
987C9HD1
December 28, 1983
TYPE CERTIFICATE DATA SHEET NO. E-243
Engines of models described herein conforming with this specification and approved data on file with the Federal Aviation
Administration meet the minimum standards for use in certificated aircraft in accordance with pertinent aircraft specifications and
applicable portions of the Civil Air Regulations provided they are installed, operated and maintained as prescribed by the
approved manufacturer's manuals and other approved instructions.
Type Certificate Holder: Curtiss-Wright/Marquette, Inc.
Fountain Inn, South Carolina
Model        Cyclone 737C9HD1,2,3,4 736C9HD1,2,3,4 740C9HD1,2
Type          9RA 16:9 Reduction Gears - - - -
Rating (with low impeller gear ratio) 7.21:1 - - - -
Maximum continuous, hp, rpm, in. Hg., at:
Rated pressure altitude (ft.) 1275-2500-45.5-3500 - - - -
Sea level pressure altitude 1275-2500-46.5-S.L. - - - -
Takeoff (Five minutes), hp, rpm, in. Hg., at:
Rated pressure altitude (ft.) 1425-2700-50.5-2600 - - - -
Sea level pressure altitude 1425-2700-51.5-S.L. - - - -
Rating (with high impeller gear ratio) 10.14:1 8.69:1 
Maximum continuous, hp, rpm, in. Hg., at:
Rated pressure altitude (ft.) 975-2500-42.0-18300 1125-2500-44.0-10600 
Low critical pressure altitude (ft.) 975-2500-43.5-12000 1125-2500-44.5-7800 
Takeoff (Five minutes), hp, rpm, in. Hg., at:
Rated pressure altitude (ft.)  1250-2700-48.0-10800 
Low critical pressure altitude (ft.)  1250-2700-49.0-6500 
Fuel (Minimum grade aviation gasoline) 100/130 - - - -
Lubricating oil MIL-L-6082, WAD - - - -
Spec 5815 or 5818
Bore and stroke, inches 6.125 x 6.875 - - - -
Displacement, cubic inches 1823 - - - -
Compression ratio 6.8:1 - - - -
Weight (dry), lb. See NOTE 5 - - 1368 (D1)
C.G. location (dry) 1373 (D2)
Fwd. of mounting face, in. 7.4 - - - -
Above prop. shaft, in. .2 - - - -
Propeller shaft, SAE No. 50 - - - -
Carburetion, Stromberg PD12K10 (D1, 2) - - PD12K10
PD12K18 (D3, 4) - -
Ignition, Dual Edison Splitdorf - - Scintilla SF9LN-4
SF9LD-3, SF9LD-5 magnetos
or Scintilla
SF9LN-4 magnetos
Timing, °BTC 20 - - - -
Spark plugs See NOTE 8 - - - -
NOTES 1,2,3,4,5,8 1,2,3,4,5,8 1,2,3,4,8
"- -" indicates "same as preceding model"
"" indicates "does not apply"

E-243 2
Model    Cyclone 987C9HD1 977C9HD1 977C9HD2 977C9HD3
Type     9RA 3:2 Direct Drive - - - -
Rating (with low impeller gear ratio) 7.21:1 - - - - - -
Maximum continuous, hp, rpm, in. Hg., at:
Rated pressure altitude (ft.) 1275-2500-46.0-3300 1275-2500-47.0-2600 - - - -
Sea level pressure altitude 1275-2500-47.5-S.L. - - - - - -
Takeoff (Five minutes), hp, rpm, in. Hg., at:
Rated pressure altitude (ft.) 1425-2700-51.5-2300 - - - - - -
Sea level pressure altitude 1425-2700-52.5-S.L. - - - - - -
Rating (with high impeller gear ratio) 10.14:1 - - 8.69:1 
Maximum continuous, hp, rpm, in. Hg., at:
Rated pressure altitude (ft.) 975-2500-42.0-18300 - - 1125-2500-42.0-
11600

Low critical pressure altitude (ft.) 975-2500-43.0-12000 - - 1125-2500-43.5-
7800

Takeoff (Five minutes), hp, rpm, in. Hg., at:
Rated pressure altitude (ft.)  1100-2600-49.0-
16000
1250-2700-46.5-
11400

Low critical pressure altitude (ft.)  1100-2600-50.0-
10200
1210-2700-48.5-
6400

Fuel (Minimum grade aviation gasoline) 100/130 - - - - - -
Lubricating oil MIL-L-6082, WAD - - - - - -
Spec 5815 or 5818
Bore and stroke, inches 6.125 x 6.875 - - - - - -
Displacement, cubic inches 1823 - - - - - -
Compression ratio 6.8:1 - - - - - -
Weight (dry), lb. 1371 1349 - - - -
C.G. location (dry)
Fwd. of mounting face, in. 7.4 6.64 - -
Above prop. shaft, in. .25 .25 above, .11 right
Propeller shaft, SAE No. 50 - - - -
Carburetion, Stromberg PD12K14 or K18 PD12K19 - - - -
Ignition, Dual Bosch S9LU-3 - - - - - -
Timing, °BTC 20 - - - - - -
Spark plugs See NOTE 8 - - - - - -
NOTES 1,2,3,7,8 1,2,3,6,7,8 1,2,3,6,7,8 1,2,3,6,7,8,9
"- -" indicates "same as preceding model"
"" indicates "does not apply"
Certification basis Type Certificate No. 243
Production basis Production Certificate No. 8
NOTE 1. Maximum permissible temperature limits are as follows:
977C9HD1,2,3 All others
Cylinder head (well type thermocouple) 450°F (500°F for T.O.) 475°F (500°F for T.O.)
Cylinder barrell 320°F (350°F for T.O.) 335°F (350°F for T.O.)
Oil inlet 220°F 220°F
NOTE 2. Minimum Maximum
Oil pressure limits (psi) 65 75
Fuel pressure limits (psi) 21 25

3 E-243
NOTE 3. The following accessory provisions are provided:
736 C9HD Direction Maximum Torque Maximum
737 C9HD of (Inch pounds) Overhang Moment
740 C9HD 977 C9HD 987 C9HD Rotation Speed Continuous Static (Inch pounds)
Starter X X X C 1.0  25,800 300
Generator and
accessory drive
X
X
C
C
3.31
2.53
300
500
3,000
2,200
350
350
Generator and
accessory drive
X C 3.31 500 2,200 350
Fuel pump X CC 1.0 16.5 450 25
Fuel pump X X CC 1.0 25 450 25
Vacuum pump X CC 1.5 50 1,200 25
Vacuum pump X X CC 1.5 100 800 25
Hydraulic pump X CC 1.5 150 2,250 50
Hydraulic pump X X CC 1.5 250 1,650 50
Propeller
Governor
X C 1.0 125 2,300 
Propeller
Governor
X X C 1.0 125 825 
Tachometer X C 0.5 25 70 
Tachometer X X C 0.5 7 50 
"C" Clockwise viewing pad, "CC" counter-clockwise
Speed - X crankshaft.
NOTE 4. Models 737C9HD2 & 4, 736C9HD2 & 4, and 740C9HD2 incorporate a torquemeter.
NOTE 5. The following dry weights will apply for Models 737C9HD1,2,3,4 and 736C9HD1,2,3,4:
Edison Splitdorf SF9LD-3, Scintilla SF9LN-4
SF9LD-5 magnetos installed magnetos installed
1360 lbs. (Models 1 & 3) 1376 lbs. (Models 1 & 3)
1365 lbs. (Models 2 & 4) 1381 lbs. (Models 2 & 4)
NOTE 6. The 977C9HD1, 2 and 3 engine ratings and limitations are applicable to helicopter installation and operation.
NOTE 7. The ratings of engine Models 977 and 987 C9HD1 are based on standard conditions of temperature and barometric
pressure (60°F and 29.92 in. Hg. at sea level) and 80% relative humidity.  If corrected to dry standard air conditions,
the rated powers would be increased approximately 2.5% at sea level to 0.4% at 15,000 ft. for equal manifold
pressure settings.
NOTE 8. The following spark plugs are approved on these engines:
AC 171, 181, 271, 273, 281, 285
BG RB19R-2, RB27R-1
Champion R-111, R-115, R-37S, R-37S-1, REA 37N, REB 37N, RHA 37N, RHB 37N, RHA 37E, RHB 37E
NOTE 9. The 977C9HD3 engine is similar to the 977C9HD1 except the high ratio impeller drive has been deactivated by the
removal of appropriate parts of the impeller drive and clutch control assembly.
.....END.....
```

## ADs (2, in force first)

- [AD 51-12-01](https://openairdocs.org/ad/51-12-01): Piston Pins · Wright Aeronautical Division, Curtiss-Wright 718C9GB1, Military Cyclone R-1820 Series, Cyclone 702C9GC1 and 29 more
- [AD 60-04-07](https://openairdocs.org/ad/60-04-07): Master Rod Assemblies · Curtiss-Wright/Marquette Cyclone 977C9HD1, Cyclone 977C9HD2 and Cyclone 977C9HD3

## STCs approved under this data sheet (1)

- [STC SEW-1](https://openairdocs.org/stc/SEW-1): Adapters and oil seals on the dual accessory housing assemblies.. Steward-Davis Inc

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