Welcome Guest. Sign in or Signup

4 Answers

RNAV SID Note

Asked by: 3733 views Aircraft Systems, FAA Regulations

Reference: (KATL) DAWGS EIGHT SID Why the note "radar required for non-GPS aircraft"? I ask because you need GPS or another form of RNAV (DME/ DME or IRU) to fly this procedure. If the aircraft is properly equipped then one can navigate this procedure without radar since the waypoints will be visible in the navigators (GPS for example) database.   Thanks for the feedback.

Ace Any FAA Written Test!
Actual FAA Questions / Free Lifetime Updates
The best explanations in the business
Fast, efficient study.
Pass Your Checkride With Confidence!
FAA Practical Test prep that reflects actual checkrides.
Any checkride: Airplane, Helicopter, Glider, etc.
Written and maintained by actual pilot examiners and master CFIs.
The World's Most Trusted eLogbook
Be Organized, Current, Professional, and Safe.
Highly customizable - for student pilots through pros.
Free Transition Service for users of other eLogs.
Our sincere thanks to pilots such as yourself who support AskACFI while helping themselves by using the awesome PC, Mac, iPhone/iPad, and Android aviation apps of our sponsors.

4 Answers



  1. John D Collins on Jul 13, 2015

    Dan,

    FAA order 8260.46E is the FAA guidance for DP’s. It states:

    (5) Except as required by paragraph 2-1-1f(3), all “RNAV 1” DPs that are annotated “DME/DME/IRU or GPS REQUIRED” must be annotated with the note: “RADAR REQUIRED FOR NON-GPS EQUIPPED AIRCRAFT.”

    Paragraph 2-1-1 (f)(3) provides for the requirement for Radar Vectors to join a portion of a SID, in which case even GPS equipped aircraft would have the note “Radar required”.

    I am guessing the note is needed because the DME-DME and DME-DME-IRU systems do not have reception of the required DME stations to determine a fix at low altitude as the aircraft departs the runway and therefor needs radar to assist with this portion of the DP.

    +1 Votes Thumb up 1 Votes Thumb down 0 Votes



  2. Dan Chitty on Jul 13, 2015

    Thanks for the feedback John. Much appreciated.

    0 Votes Thumb up 0 Votes Thumb down 0 Votes



  3. Russ Roslewski on Jul 14, 2015

    Yes, the typical reason for this note is that the procedure has failed what is called a “DME/DME Assessment”. In order for DME/DME RNAV to provide acceptable position accuracy, the configuration and number of DME sources has to meet certain parameters. Each segment is evaluated, so sometimes you will see notes like “GPS required for XXX transition” where just that transition failed the DME/DME evaluation.

    +1 Votes Thumb up 1 Votes Thumb down 0 Votes



  4. Dan Chitty on Jul 14, 2015

    Thanks Russ for the additional feedback. Much appreciated.

    0 Votes Thumb up 0 Votes Thumb down 0 Votes


The following terms have been auto-detected the question above and any answers or discussion provided. Click on a term to see its definition from the Dauntless Aviation JargonBuster Glossary.

Answer Question

Our sincere thanks to all who contribute constructively to this forum in answering flight training questions. If you are a flight instructor or represent a flight school / FBO offering flight instruction, you are welcome to include links to your site and related contact information as it pertains to offering local flight instruction in a specific geographic area. Additionally, direct links to FAA and related official government sources of information are welcome. However we thank you for your understanding that links to other sites or text that may be construed as explicit or implicit advertising of other business, sites, or goods/services are not permitted even if such links nominally are relevant to the question asked.