Appendix 3 A3-2 LOC Instrument Landing System Localizer MDA(H) Minimum Descent Altitude (Height) MLS Microwave Landing System MSL Mean Sea Level MSP Mode Select Panel MUH Minimum Use Height [autopilot] NAV Navigation ND Navigation Display NDB Non Directional Beacon NPRM Notice of Proposed Rulemaking PAN-OPS Procedures for Air Na vigation Services–Operations PF Pilot Flying PFD Primary Flight Display PNF Pilot Not Flying RNAV Area Navigation RNP Required Navigation Performance RTO Rejected Takeoff RVSM Reduced Vertical Separation Minimum SAE Society of Automotive Engineers TCAS Traffic Alert and Collision Avoidance System TCS Touch Control Steering TERPS Terminal Instrument Procedures TO Takeoff TOGA Takeoff or Go–Around VDF/ MDF Demonstrated Flight Dive Speed/Demonstrated Flight Dive Mach VMO/ MMO Maximum Operating Limit Speed/Maximum Operating Limit Mach VR Rotation Speed VSR Reference Stall Speed (See § 25.103) V2 Takeoff Safety Speed VMC Visual Meteorological Conditions VNAV Vertical Navigation VOR Very High Frequency Omnirange Station WAT Weight Altitude Temperature xLS ILS, MLS, or GLS
Advisory circular · Approval of Flight Guidance Systems
A newer version is currentThis is a historical version. AC 25.1329-1C CHG 2 is the version in force, approved October 27, 2014.
- Approved
- October 16, 2012
- Last reviewed
- December 19, 2012
- Cancels
- AC25.1329-1A
- Cancelled by
- AC25.1329-1C
- Family
- AC 25.1329-1 · 4 versions
- Revision
- B
- 14 CFR parts
- 25
- Cited by
- 1 AD
Guidance, not mandatory unless a rule or AD requires it. DRS record last changed November 21, 2025.
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Versions of AC 25.1329-1
AC 25.1329-1CHistoricalApproval of Flight Guidance SystemsAC 25.1329-1C CHG 2Change 2 provides clarification on the autopilot disengagement aural alert. Change 2 also provides clarification about potential hazards for systems without automatic disengagement to address the automatic trim response to an override of the autopilot. Change 2 also provides clarification about potential hazards caused by incompatible mode engagement. Change 2 updates references to related ACs and industry documents.
AC 25.1329-1BHistoricalApproval of Flight Guidance Systems
AC 25.1329-1AHistoricalAutomatic Pilot Systems ApprovalADs that cite this AC · 1
AD 2020-24-02Auto flight, Flight controls, and Indicating/recording systems · Boeing 737-8 and 737-9
Citations are matched to the AC family, so each one leads to the version in force today.