737 Flight Crew Training Manual
Check that the marker beacon is selected on the audio panel. The course and glide slope signals are reliable only when their warning flags are not displayed, localizer and glide slope pointers are in view, and the ILS identifier is received. Confirm the published approach inbound course is set or displayed.
Do not use radio navigation aid facilities that are out of service even though flight deck indications appear normal. Radio navigation aids that are out of service may have erroneous transmissions that are not detected by airplane receivers and no flight deck warning is provided to the crew.
Approach Briefing
Before the start of an instrument approach, the PF should brief the PM of his intentions in conducting the approach. Both pilots should review the approach procedure. All pertinent approach information, including minimums and missed approach procedures, should be reviewed and alternate courses of action considered.
As a guide, the approach briefing should include at least the following:
.
weather and NOTAMS at destination and alternate, as applicable
.
type of approach and the validity of the charts to be used
.
navigation and communication frequencies to be used
.
minimum safe sector altitudes for that airport
.
approach procedure including courses and heading
.
vertical profile including all minimum altitudes, crossing altitudes and
approach minimums
.
determination of the Missed Approach Point (MAP) and the missed
approach procedure
. other related crew actions such as tuning of radios, setting of course
information, or other special requirements
.
taxi routing to parking
.
any appropriate information related to a non-normal procedure
.
management of AFDS.
Approach Category
FAA Category Speed
C 121 knots or more but less than 141 knots
D 141 knots or more but less than 166 knots
Speed - based upon a speed of VREF in the landing configuration at maximum certificated landing weight.
Copyright . The Boeing Company. See title page for details.
FCT 737 (TM) October 31, 2006
ICAO Category Range of Speeds at Threshold Range of Speeds for Initial Approach Range of Speeds for Final Approach Max Speeds for Visual Maneuvering (Circling) Max Speeds for Missed Approach
Inter-mediate Final
C 121/140 160/240 115/160 180 160 240
D 141/165 185/250 130/185 205 185 265
Speeds at threshold - based upon a speed of VREF in the landing configuration at maximum certified landing weight.
The designated approach category for an aircraft type is defined by the landing reference speed (VREF) at the maximum certified landing weight under both USA and ICAO criteria.
Under USA criteria, an aircraft approach category is used for straight-in approaches only. For circling approaches, the anticipated circling speed at the actual weight is used to determine the required approach minimums. Circling approach minimums are normally published on instrument procedures charts as a function of maximum airplane speeds for circling in lieu of airplane approach categories.
Under ICAO criteria, an aircraft approach category is used for both straight-in and circling approaches to determine the required approach minimums. The aircraft category for a circling approach may be different than that for a straight-in approach.
. The 737 is classified as a Category “C” airplane for straight-in
approaches.
Circling approach minimums for both USA and ICAO criteria are based on obstruction clearance for approach maneuvering within a defined region of airspace. The region of airspace is determined as a function of actual airplane speed. This region gets larger with increasing speed, which may result in higher approach minimums depending on the terrain characteristics surrounding the airport. Similarly, approach minimums may decrease as speed is reduced. However, the use of different circling approach minimums based on actual approach speeds does not change the designated approach category of the airplane.
Approach Clearance
When cleared for an approach and on a published segment of that approach, the pilot is authorized to descend to the minimum altitude for that segment. When cleared for an approach and not on a published segment of the approach, maintain assigned altitude until crossing the initial approach fix or established on a published segment of that approach. If established in a holding pattern at the final approach fix, the pilot is authorized to descend to the procedure turn altitude when cleared for the approach.
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