The Synchro,transmitter, cataloged under National Stock Number 5990-00-682-9933, is classified within Federal Supply Class 5990 (Synchros and Resolvers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Kearfott Corp Div Kearfott Corporation. Government technical data includes 29 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5990-00-682-9933 |
| Primary Part Number | 7RS911-21A |
| Item Name | Synchro,transmitter |
| FSC / FSG | 5990 / 59 — Synchros and Resolvers |
| Manufacturer | Kearfott Corp Div Kearfott Corporation |
| Status | ACTIVE |
| Body Size | 11 |
| Shaft Type | ROUND, SLOTTED SINGLE SHAFT |
| Zrs Impedance Angle in Deg | 23.90 NOMINAL |
| Flange Diameter | 1.0620 INCHES NOMINAL IN |
| Undercut Width | 0.0500 INCHES NOMINAL IN |
| Shaft Diameter | 0.1195 INCHES MINIMUM AND 0.1200 INCHES MAXIMUM SINGLE SHAFT IN |
| Rotor DC Resistance in Ohms | 9.00 NOMINAL |
| Undercut Diameter | 0.9800 INCHES MAXIMUM IN |
| Length | 0.0620 INCHES NOMINAL SHOULDER IN |
| Fragility Factor | MODERATELY RUGGED |
| Body Style | STANDARD ROUND C |
| Shaft Radial Play Determining Weight | 4.0 OUNCES OZ |
| Zrs Impedance Magnitude in Ohms | 23.00 NOMINAL |
| Flange Thickness | 0.0930 INCHES NOMINAL IN |
| Shaft Maximum Runout | 0.0010 INCHES IN |
| Rotor Input Electrical Power Rating | 950.0 MILLIWATTS NOMINAL |
| Alignment Hole Bolt Circle Diameter | 0.8120 INCHES NOMINAL IN |
| Zro Impedance Angle in Deg | 81.70 NOMINAL |
| Phase Shift Angle in Deg | 7.000 INPUT TO OUTPUT NOMINAL |
| Mounting Surface to Terminal End Distance | 1.9550 INCHES NOMINAL IN |
| Frequency in Hertz | 400.0 NOMINAL |
| Terminal Location | SIDE |
| Rotor Input Voltage Rating in Volts | 26.0 NOMINAL |
| Shaft End Play Determining Weight | 8.0 OUNCES OZ |
| Shaft Maximum Radial Play | 0.0008 INCHES IN |
| Schematic Diagram Designator | 1 Y-ROTOR, 1 STATOR |
| Alignment Hole Quantity | 4 |
| Zso Impedance Angle in Deg | 79.50 NOMINAL |
| Shaft Length | 0.2830 INCHES NOMINAL SINGLE SHAFT IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 7RS911-21A | Kearfott Corp Div Kearfott Corporation (USA) |
| Reference | Meaning |
|---|---|
| TGH11ES4 | 5/2 Secondary reference U.S. Government activity |
| ES1608A | 3/9 Design control — primary reference Drs Sustainment Systems, Inc. |
| 7R911-21A | 5/9 Secondary reference U.S. Government activity |
NSN 5990-00-682-9933 is a Synchro,transmitter, manufactured by Kearfott Corp Div Kearfott Corporation, classified under FSC 5990, Synchros and Resolvers. Status: active.
NSN 5990-00-682-9933 has 1 manufacturer part number on file: 7RS911-21A (Kearfott Corp Div Kearfott Corporation).
Key specifications for 7RS911-21A: Body Size: 11; Shaft Type: ROUND, SLOTTED SINGLE SHAFT; Zrs Impedance Angle in Deg: 23.90 NOMINAL; Flange Diameter: 1.0620 INCHES NOMINAL IN. 29 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 5990-00-682-9933 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.