Collection: Airbus Helicopters Hydraulic Servo Controls
Airbus Helicopters hydraulic servo controls
The main rotor hydraulic servo controls (servocontrols) translate the pilot's cyclic and collective inputs into blade pitch. On the H125 (AS350 B3), AS355 TwinStar and H130 / EC130, three main rotor servos act on the swashplate: front, left and right. They are flight-critical, serialized components (ATA 67 – Rotor Flight Control) and are supplied overhauled or on exchange with EASA Form 1.
Servo controls and cross-reference
| P/N |
Airbus P/N / cross-reference |
Description |
Airbus effectivity |
Condition |
| SC8042 |
704A44-8311-02 · 8042 · NSN 1650-14-403-5683 |
Servo-control, front and LH |
AS350 B3 (H125) · AS355 F, F1, F2, N, NP · EC130 B4, T2 |
Overhauled / exchange |
| SC8043 |
704A44-8311-03 · 8043 · NSN 1650-14-403-5684 |
Servo-control, RH |
AS350 B3 (H125) · AS355 F, F1, F2, N, NP · EC130 B4, T2 |
Overhauled / exchange |
| SA7450-100 |
704A44-8311-70 (704A44831170) · SA7450-000 |
Servo-actuator with detector |
AS350 B3 (H125) · AS355 F, F1, F2, N, NP · EC130 B4, T2 |
Overhauled / exchange |
| 704A34-412-033 |
NSN 4720-14-428-8933 |
Hose (forward servo-control hydraulic line) |
AS350 B, B1, B2, B3, BA, BB, C, D · AS355 E, F, F1, F2, N, NP |
New |
Effectivity per the Airbus Helicopters Technical Catalog – Spare Parts and Ground Support (Ecureuil and EC 130), September 2026. Earlier AS350 versions (B, B1, B2, BA, D) use different servo P/Ns – send us your registration and we will confirm.
Exchange and overhaul
Main rotor servos are usually supplied on an exchange basis: you receive an overhauled unit with its release certificate and return your removed core. Send us the P/N, the serial number of your unit and your delivery location and we will reply with price, core terms and lead time, including AOG requests.
Why Blackbird Aviation
- Founded by a helicopter pilot; focused on Airbus Helicopters H125, H130, AS355 and H135 operators.
- Stock in Fort Lauderdale (USA) and São Paulo (Brazil); worldwide shipping.
- Every part ships with the manufacturer's release document and a Blackbird Certificate of Conformance with lot traceability.
Always confirm eligibility for your aircraft model and serial number against the Airbus Helicopters IPC and your approved maintenance data. See also all Airbus Helicopters parts, Airbus Helicopters bearings and Airbus Helicopters batteries.
