AD 74-10-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | TPE331-1 | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331-1-151B, -2-201C, -3U-307G, -5-251C, -5-251K and -6-251M Engines |
| engine | Honeywell International Inc. | TPE331-2 | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331-1-151B, -2-201C, -3U-307G, -5-251C, -5-251K and -6-251M Engines |
| engine | Honeywell International Inc. | TPE331-3U | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331-1-151B, -2-201C, -3U-307G, -5-251C, -5-251K and -6-251M Engines |
| engine | Honeywell International Inc. | TPE331-5 | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331-1-151B, -2-201C, -3U-307G, -5-251C, -5-251K and -6-251M Engines |
| engine | Honeywell International Inc. | TPE331-6 | AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331-1-151B, -2-201C, -3U-307G, -5-251C, -5-251K and -6-251M Engines |
Unsafe Condition
Loosening of the fuel control assembly mounting and support bracket fasteners.
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Required Actions
Replace the fuel control assembly support bracket within 25 hours time in service after the effective date. Inspect and retorque the mounting fasteners within 100 hours time in service after the replacement or 25 hours after the effective date, whichever is later, and every 100 hours thereafter. Modify the bracket attachment lug and fastener within 1000 hours time in service or one year after the effective date. Install washers and bolts per revised service bulletins if modifications were already done.
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Compliance Time
Within the next 25 hours time in service after the effective date of this AD, unless previously accomplished. The recurring inspection must be done within 100 hours time in service after the replacement or 25 hours after the effective date, whichever occurs later, and intervals not to exceed 100 hours time in service thereafter. The modification must be done within 1000 hours time in service or within one year after the effective date.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
AIRESEARCH MANUFACTURING COMPANY OF ARIZONA Model TPE331-1-151B, -2-201C, -3U-307G, -5-251C, -5-251K and -6-251M engines.
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
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