ASR Approach - P-3050101

INSTRUMENT FLIGHT RULES WORKBOOK

CHAPTER THREE

305. NONPRECISION APPROACHES

A nonprecision approach provides directional (azimuth) guidance only; altitude restrictions are

listed in the approach procedure (FLIP Low Altitude Approach Plates). The pilot flies the

aircraft along the depicted or directed course, keeping the aircraft within the published altitude

restrictions as it descends toward the airport. Nonprecision approaches may be based upon

VOR, VOR/DME, TACAN, NDB, GPS, or Localizer radio aids, or upon communications from a

controller.

306. ASR APPROACH

The ASR approach is a nonprecision radar ground controlled approach. During an ASR

approach, the radar controller will provide the pilot with azimuth information in the form of

headings to fly. All altitude information will be advisory. The controller will state, if the pilot

requests, the recommended altitude at each mile of the approach.

The ASR ground controlled approach also requires two-way radio communications and cannot

be used for selection of an alternate airport for single-piloted aircraft

An example of the controller's instruction would be:

"ON COURSE, TWO MILES FROM RUNWAY, ALTITUDE SHOULD BE ONE

THOUSAND EIGHT HUNDRED FEET."

307. LOCALIZER APPROACH

A localizer (LOC) approach is a nonprecision approach using the ILS localizer for course

guidance (no glidepath information is provided). To execute a LOC approach, an aircraft must

be equipped with a VHF navigation receiver able to receive the LOC frequency range of 108.1 to

111.9 MHz. LOC frequencies will always end in odd tenths. When executing a LOC approach

the CDI is used to display course information.

With a localizer frequency tuned the CDI becomes four times more sensitive, displaying .5 per

mark instead of 2. Additionally, the OBS knob has no effect on CDI movement and the

TO/FROM flag disappears from view. The VOR needle will freeze at the 3 o'clock position.

Additional navigation equipment (LF/MF ADF, marker beacon, or DME) is required for the pilot

to know the distance from the runway. A Localizer approach may be executed when the Initial

Approach Fix, Final Approach Fix, and Missed Approach Point can be identified. Approach

Control can use radar to assist in determining these fixes during practice approaches.

NDB (Non-directional Beacon) approaches are published for both LF/MF and UHF Non-

directional Radio Beacons. The T34C is not equipped to receive either type of signal, and

therefore cannot execute either approach.

INSTRUMENT APPROACH PROCEDURES 3-7