AD 83-13-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-100B Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-200B Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-200C Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-200F Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-300 Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-400 Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-400D Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-400F Series | BOEING Model 747 Airplanes |
Unsafe Condition
False altitude information from the Collins Model 860F-4 or Bendix Model ALA 51A Low Range Radio Altimeter (LRRA) to the autopilot could cause hard landing.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install a placard on the autopilot P10 mode control panel stating 'DO NOT USE AUTOPILOT BELOW 50 FT. ON WET RUNWAYS' within 15 days after the effective date. Additionally, remove and modify Collins or Bendix LRRA units per respective service bulletins, or use alternate means of compliance approved by FAA.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 15 days after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
All model 747 airplanes except the 747SP, equipped with either LCLU or LRCU automatic landing systems and either Collins Model 860F-4 or Bendix Model ALA 51A LRRA.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.