AD 57-25-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aircraft Dusting & Spraying | Spray Pressure Regulator | Airworthiness Directives; Applies to All Aircraft engaged in Spraying Operations |
Unsafe Condition
Failure of the diaphragm in a spray pressure regulator permitted spray fluid to enter the cockpit through the regulator vent.
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Required Actions
All diaphragm type pressure regulators must be vented to the outside of the airplane using a suitable tubing or hose extension to the outside of the fuselage, similar to spray tank venting in Section 2.415, Appendix A, of CAM 8.
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Compliance Time
February 1, 1958
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Affected Aircraft
All Aircraft engaged in Spraying Operations, including Restricted Purpose Aircraft Certificated Under CAR Part 8 equipped with diaphragm type spray pressure regulators vented in the cockpit.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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