# TCDS E-289: Curtiss-Wright/Marquette Inc.

- Type: Type certificate data sheet
- Status: Current
- Holder: Curtiss-Wright/Marquette Inc.
- Revision: 2
- Revised: December 28, 1983
- Product: Engine
- Data sheet PDF: https://openairdocs.org/files/sha256/12/dc/12dcc48d48c2afbd3c6a0e7bb4c728b0fe0d9c34b92970b6c86ef66bf882b406
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5E357FBADCC2713C8525670B006C502F.0001
- Page: https://openairdocs.org/tcds/E-289

## Models (1)

As the data sheet lists them.

- Cyclone 990C7BA1

## 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
Rev. No. 2 2
FEDERAL AVIATION AGENCY
E-289
Revision 2
WRIGHT
Cyclone
990C7BA1
December 28, 1983
AIRCRAFT ENGINE SPECIFICATION
Engines of models described herein conforming with this specification and approved data on file with the Federal Aviation
Agency 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.
Manufacturer Curtiss-Wright/Marquette, Inc.
Fountain Inn, South Carolina
Model Cyclone 990C7BA1
Type 7RA Direct drive
Rating (impeller gear ratio) 7.21:1
Maximum continuous hp, rpm, in.Hg., at:
Critical pressure altitude (ft.) 700-2400-37.0-7300
Sea level pressure altitude 700-2400-39.5-S.L.
Takeoff hp, rpm, in.Hg., at:
Critical pressure altitude (ft.) 800-2600-42.5-5500
Sea level pressure altitude 800-2600-43.5-S.L.
Fuel  (minimum grade aviation gasoline) Grade 91/96
Lubricating oil WAD Specification No. 5815 or 5818
Bore and stroke, in. 6.125 X 6.312
Displacement, cu. in. 1301
Compression ratio 6.2:1
Weight (dry), lb. 1070
C.G. location (dry)
Foward of mounting flange centerline, in. 5.29
Above propeller shaft, in. 0.08
Propeller shaft, SAE No. 40
Crankshaft dampers  -  Torsional & Lateral 3 1/2 order  -  Front & Rear
Carburetion Stromberg PD9G1
Ignition, dual Bosch S7LU-3 magnetos
Timing, °BTC 20
Spark plugs See Note 4.
NOTES 1, 2, 3, 4, 5
Certification basis Type Certificate No. 289 issued August 9, 1956
Production basis Production Certiicate No. 8
NOTE 1. Maximum permissible temperatures:
Cylinder Head Cylinder Base Oil Inlet
450°F 325°F 220°F
500°F for takeoff only

E-289 2
NOTE 2. Fuel and oil pressure limits:
Maximum Minimum
Fuel pressure 23 21
Oil pressure 70 60
NOTE 3. The following accessory provisions are provided:
Direction of
Maximum Torque
(in.-lb.)
Maximum
Overhang Moment
Accessory Rotation* Speed** Cont. Static (in.-lb.)
Starter C 1.000:1 — 25800 300
Fuel pump CC 1.000:1 25 450 —
Tachometer C 0.500:1 7 50 —
Spare C 0.500:1 7 50 —
  *"C"  -  clockwise;  "CC"  -  counter-clockwise facing engine pad
**Speed  -  times crankshaft rpm
NOTE 4. The following spark plugs are approved on these engines:
AC 172, 181, 272, 281
BG RB19R-2, RB27R-1
Champion R119, R819, REA87N, REB87N, RHA87N, RHB87N
NOTE 5. This engine is approved for helicopter application and operation, and is eligible for installation in a
39° nose-up attitude.
....END.....
```

## ADs

None name its models.

## STCs approved under this data sheet (1)

- [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.

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