AD 91-12-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Polskie Zaklady Lotnieze Spolka zo.o | PZL M18 | Airworthiness Directives; WYTWORNIA SPRZETU KOMUNEKACYJNEGO PZL-MIELEC Model M18 airplanes |
Unsafe Condition
Failure of the electro-hydraulic control system that results in loss of flap and brake control.
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Required Actions
Replace each flexible hose with part number D73.7/21.00.0 or D73.7/24.00.0 with a new hose per PZL-Mielec Mandatory Engineering Bulletin K/02.141/90. For S/N 1Z013-21 through 1Z022-05, modify the electro-hydraulic control system per the bulletin. Use special flight permits under FAR 21.197/21.199 if needed.
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Compliance Time
Within 25 hours time-in-service after July 5, 1991 (for hose replacement) or within 100 hours time-in-service after July 5, 1991 (for system modification), whichever occurs later than the respective 200 or 500 hours TIS thresholds.
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Affected Aircraft
WYTWORNIA SPRZETU KOMUNEKACYJNEGO PZL-MIELEC Model M18 airplanes, serial numbers 1Z013-21 through 1Z023-30, equipped with agriculture equipment electro-hydraulic control system (Modification D73.701.00.1).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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