The Synchro,transmitter, cataloged under National Stock Number 5990-00-902-5267, is classified within Federal Supply Class 5990 (Synchros and Resolvers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Honeywell Intl Inc Defense Avionics Systems. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5990-00-902-5267 |
| Primary Part Number | AY-503M-26-A1 |
| Item Name | Synchro,transmitter |
| FSC / FSG | 5990 / 59 — Synchros and Resolvers |
| Manufacturer | Honeywell Intl Inc Defense Avionics Systems |
| Status | ACTIVE |
| Body Size | 10 |
| Shaft Type | ROUND, SLOTTED SINGLE SHAFT |
| Zso-90 Resistance in Ohms | 9.10 NOMINAL |
| Flange Diameter | 0.9360 INCHES MINIMUM AND 0.9370 INCHES MAXIMUM IN |
| Undercut Width | 0.0620 INCHES NOMINAL IN |
| Shaft Diameter | 0.0880 INCHES MINIMUM AND 0.0900 INCHES MAXIMUM SINGLE SHAFT IN |
| Rotor DC Resistance in Ohms | 26.00 NOMINAL |
| Undercut Diameter | 0.8350 INCHES MINIMUM AND 0.8400 INCHES MAXIMUM IN |
| Length | 0.0620 INCHES NOMINAL SHOULDER IN |
| Body Style | STANDARD ROUND C |
| Flange Thickness | 0.0630 INCHES NOMINAL IN |
| Torque Gradient Per Angular Deg | 2250.0 MILLIMETER-MILLIGRAMS NOMINAL MM |
| Plus J Zso-90 Reactance in Ohms | 10.70 NOMINAL |
| Rotor Input Electrical Power Rating | 1.7 WATTS NOMINAL |
| Mounting Surface to Terminal End Distance | 1.2410 INCHES MAXIMUM IN |
| Frequency in Hertz | 400.0 NOMINAL |
| Zro Resistance in Ohms | 35.000 NOMINAL |
| Plus J Zso Reactance in Ohms | 31.00 NOMINAL |
| Zrs Resistance in Ohms | 66.00 NOMINAL |
| Terminal Location | REAR |
| Rotor Input Voltage Rating in Volts | 26.0 NOMINAL |
| Shaft Length | 0.4130 INCHES NOMINAL SINGLE SHAFT IN |
| Body Material | ALUMINUM |
| Pilot Diameter | 0.4995 INCHES MINIMUM AND 0.5000 INCHES MAXIMUM IN |
| Shoulder Diameter | 0.8118 INCHES MINIMUM AND 0.8123 INCHES MAXIMUM IN |
| Shaft Slot Width | 0.0230 INCHES NOMINAL SINGLE SHAFT IN |
| Plus J Zro Reactance in Ohms | 145.00 NOMINAL |
| Pilot Length | 0.0380 INCHES NOMINAL IN |
| Zso Resistance in Ohms | 10.30 NOMINAL |
| 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 |
|---|---|
| AY-503M-26-A1 | Honeywell Intl Inc Defense Avionics Systems (USA) |
| Reference | Meaning |
|---|---|
| 1290299-139 | 3/2 Design control — primary reference U.S. Government activity |
| 1290299-139 | 5/9 Secondary reference Honeywell Intl Inc Defense Avionics Systems |
NSN 5990-00-902-5267 is a Synchro,transmitter, manufactured by Honeywell Intl Inc Defense Avionics Systems, classified under FSC 5990, Synchros and Resolvers. Status: active.
NSN 5990-00-902-5267 has 1 manufacturer part number on file: AY-503M-26-A1 (Honeywell Intl Inc Defense Avionics Systems).
Key specifications for AY-503M-26-A1: Body Size: 10; Shaft Type: ROUND, SLOTTED SINGLE SHAFT; Zso-90 Resistance in Ohms: 9.10 NOMINAL; Flange Diameter: 0.9360 INCHES MINIMUM AND 0.9370 INCHES MAXIMUM 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 5990-00-902-5267 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.