Flight Training Instruction - Cnatra - U.S. Navy

CHAPTER NINE T-6B PRIMARY INSTRUMENT NAVIGATION
905. RADAR APPROACHES
Radar approaches fall into two classes:
1. Precision Approach Radar (PAR) approaches provide course, range, and glideslope
information.
2. Airport Surveillance Radar (ASR) approaches provide course and range information only,
and are thus non–precision approaches.
906. PRECISION APPROACH RADAR (PAR)
Description. The PAR approach uses ground radar to vector the aircraft to a position to land.
You have been introduced to vectoring procedures during radar vectors to final approach course.
During the radar vector procedure, the approach controller used radar to direct the aircraft onto a
segment of a standard Instrument Approach Procedure. During a radar approach, the controller
directs the aircraft to a position from which a safe landing can be made.
Preflight – Radar instrument approach minimums are published in the front of FLIP Terminal
Instrument Approach Procedures (approach plates) and sometimes in the minimums section of
the approach plate. Published information includes the Decision Altitude (DA), weather
minimums, and glideslope angle. With glideslope angle and groundspeed, the pilot can
determine the rate of descent required to maintain glideslope on final using the rate of descent
table (also in the back of the approach plates).
Familiarize yourself with this information as part of your preflight planning when a radar
approach (PAR or ASR) is available at your destination or alternate.
For the purposes of illustration, consider the PAR approach to RWY 19L at NAS Meridian MS
(Figure 9-4).
9-12 FINAL APPROACH PROCEDURES
NOTE
The T–6B is considered a single-piloted aircraft. OPNAV 3710.7
requires that single-piloted aircraft use 200’ ceiling/HAT and ½
mile/2400’ RVR as absolute minimums for instrument approaches.
Consider the above example. When you reach the published DA
of 417’ MSL, you will be at a HAT of 100’ AGL. In order to meet
the 200’ HAT absolute minimum, you must increase the DA. In
this case, an increase of 100’ is necessary. This would result in a
modified DA of 517’ MSL, resulting in a HAT of 200’ AGL. In
addition, the minimum visibility required to commence the
approach becomes ½ mile instead of the ¼ mile.