AD 83-06-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aermacchi S.p.A. | F.260 | Airworthiness Directives; SIAI-Marchetti Models F260, F260B, and F260C Series Airplanes |
| aircraft | Aermacchi S.p.A. | F.260B | Airworthiness Directives; SIAI-Marchetti Models F260, F260B, and F260C Series Airplanes |
| aircraft | Aermacchi S.p.A. | F.260C | Airworthiness Directives; SIAI-Marchetti Models F260, F260B, and F260C Series Airplanes |
Unsafe Condition
Failure of the propeller governor relief valve spring could cause propeller overspeed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the relief valve spring PN A-3107 for cracks or breakage per SB 260B35. If cracked or broken, repair and bench test the governor assembly at an approved facility. Replace rectangular port relief valve bodies (PN A-3173) with round port versions per SB Fig. No. 2. Adjust inspection intervals up to 10% for maintenance coordination.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 100 hours time-in-service after the effective date and at each 100 hour interval for rectangular port bodies; within 500 hours time-in-service and at each 500 hour interval for round port bodies. Replace rectangular port valve bodies within 500 hours time-in-service or next propeller overhaul, whichever comes first.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
SIAI-Marchetti Models F260, F260B, F260C equipped with propeller governors having Hartzell PN F4-4A, F4-4A (F4-11), F4-112, F6-15A or equivalent SIAI-Marchetti PNs 260-13-272-01, -05, -03, -07, -09.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.