AD 93-07-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | ATR - GIE Avions de Transport R gional | ATR42-300 | Airworthiness Directives; AEROSPATIALE Model ATR42-300, ATR72-100 and - 200 Series Airplanes |
| aircraft | ATR - GIE Avions de Transport R gional | ATR42-320 | Airworthiness Directives; AEROSPATIALE Model ATR42-300, ATR72-100 and - 200 Series Airplanes |
| aircraft | ATR - GIE Avions de Transport R gional | ATR72-101 | Airworthiness Directives; AEROSPATIALE Model ATR42-300, ATR72-100 and - 200 Series Airplanes |
| aircraft | ATR - GIE Avions de Transport R gional | ATR72-102 | Airworthiness Directives; AEROSPATIALE Model ATR42-300, ATR72-100 and - 200 Series Airplanes |
| aircraft | ATR - GIE Avions de Transport R gional | ATR72-201 | Airworthiness Directives; AEROSPATIALE Model ATR42-300, ATR72-100 and - 200 Series Airplanes |
| aircraft | ATR - GIE Avions de Transport R gional | ATR72-202 | Airworthiness Directives; AEROSPATIALE Model ATR42-300, ATR72-100 and - 200 Series Airplanes |
| aircraft | ATR - GIE Avions de Transport R gional | ATR72-211 | Airworthiness Directives; AEROSPATIALE Model ATR42-300, ATR72-100 and - 200 Series Airplanes |
| aircraft | ATR - GIE Avions de Transport R gional | ATR72-212 | Airworthiness Directives; AEROSPATIALE Model ATR42-300, ATR72-100 and - 200 Series Airplanes |
| aircraft | ATR - GIE Avions de Transport R gional | ATR72-212A | Airworthiness Directives; AEROSPATIALE Model ATR42-300, ATR72-100 and - 200 Series Airplanes |
Unsafe Condition
Failure of the pressurization valves to close in the event of ditching and interruption of electrical power to certain electrical equipment used during approach and landing.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove and identify date codes of electrical switches (part numbers 9PD and 12HM) per applicable service bulletins. Replace switches with date codes A6, A7, A8, A9, AO, AN, AD, B1, B2, B3, B4, B5, B6, or B7 before further flight. Prohibit installation of switches with those date codes. Allow alternative compliance with FAA approval.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 30 days after the effective date of this AD (May 10, 1993) for removal and identification. Replacement required before further flight if date codes are listed. Compliance with (b) is immediate as of the effective date.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
All Model ATR42-300 series airplanes, and all Model ATR72-100 and -200 series airplanes; certificated in any category.
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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