AD 91-07-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-100 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-200 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-200C Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-300 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-400 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-500 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-600 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-700 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-800 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 757-200 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
Unsafe Condition
Blanking of either pilot's Electronic Flight Instrument System (EFIS) display and loss of one pilot's primary flight instruments.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 10 days after the effective date, inspect EFIS symbol generators and record modification status. Remove and modify symbol generators without Modification 3 per Collins Service Bulletin EFIP-701E-34-03 before further flight. Modify any S242T404-420 symbol generators without Modification 3 per the same service bulletin before installation.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 10 days after the effective date of this AD
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Affected Aircraft
Boeing Model 737 series airplanes, line numbers 1975 through 1989; and Model 757 series airplanes, line numbers 338 through 343; equipped with Electronic Flight Instrument System (EFIS) using symbol generators, part number S242T404-420.
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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