AD 81-25-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-11 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50, and -80 Series, C-9A, C-9B, and VC-9C Airplanes |
| aircraft | The Boeing Company | DC-9-12 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50, and -80 Series, C-9A, C-9B, and VC-9C Airplanes |
| aircraft | The Boeing Company | DC-9-13 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50, and -80 Series, C-9A, C-9B, and VC-9C Airplanes |
| aircraft | The Boeing Company | DC-9-14 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50, and -80 Series, C-9A, C-9B, and VC-9C Airplanes |
| aircraft | The Boeing Company | DC-9-15 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50, and -80 Series, C-9A, C-9B, and VC-9C Airplanes |
| aircraft | The Boeing Company | DC-9-15F | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50, and -80 Series, C-9A, C-9B, and VC-9C Airplanes |
| aircraft | The Boeing Company | DC-9-21 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50, and -80 Series, C-9A, C-9B, and VC-9C Airplanes |
| aircraft | The Boeing Company | DC-9-31 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50, and -80 Series, C-9A, C-9B, and VC-9C Airplanes |
| aircraft | The Boeing Company | DC-9-32 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50, and -80 Series, C-9A, C-9B, and VC-9C Airplanes |
| aircraft | The Boeing Company | DC-9-32 (VC-9C) | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50, and -80 Series, C-9A, C-9B, and VC-9C Airplanes |
Unsafe Condition
PPG Industries windshield panels manufactured between November 1, 1978, and December 31, 1980, may have out-of-tolerance heating element resistance, which could compromise bird impact protection and anti-ice functions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect windshield panels to determine manufacturer and year of manufacture. For PPG panels with November 1, 1978, through December 31, 1980, manufacturing dates, perform heating element resistance checks using an ohmmeter. Depending on resistance readings, install placards restricting airspeed or icing conditions, or replace panels with LOF-manufactured or non-PPG 1978-1980 panels. Repetitive inspections at 50-hour intervals until 200 flight hours may be required, followed by 1,500-hour intervals if within tolerance.
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Compliance Time
within six months from the effective date of this AD
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Affected Aircraft
McDonnell Douglas Model DC-9-10, -20, -30, -40, -50, and -80 series airplanes, including C-9A, C-9B, and VC-9C airplanes, fuselage numbers 894 through 1021, and those with left, center, or right windshield panels replaced since November 1, 1978.
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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