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NORMAL OPERATIONS
NON PRECISION APPROACH
PREFACE
Applicable to: ALL
This chapter deals with some characteristics of the Non Precision Approach (NPA). Recommendations mentioned Refer to NO-100 preface.NPA are defined as:
? VOR approach
? NDB approach
? LOC, LOC-BC approach
? R-NAV approach.
APPROACH STRATEGY
Applicable to: ALL
The overall strategy of NPA completion is to fly it "ILS alike" with the same mental image or representation and similar procedure. Instead of being referred to an ILS beam, the AP/FD guidance modes and associated monitoring data are referred to the FMS F-PLN consolidated by raw data. LOC only approach is the exception where LOC mode and localizer scale are to be used. This explains why the crew must ensure that the FMS data is correct, e.g. FMS accuracy, F-PLN (lateral and vertical) and proper leg sequencing.
The use of AP is recommended for all non-precision approaches as it reduces crew workload and facilitates monitoring the procedure and flight path.
LIMITATIONS
Applicable to: ALL
Lateral and vertical managed guidance (FINAL APP) can be used provided the following conditions are met:
? The approach is defined in the navigation database
? The approach has been crosschecked by the crew with the published procedure
? The final approach is not modified by the crew.
INITIAL APPROACH
Applicable to: ALL
NAVIGATION ACCURACY
The navigation accuracy check is most essential since it determines
? The AP/FD guidance mode to be used
? The ND display mode to be used
? Which raw data which are to be used.
NORMAL OPERATIONS
NON PRECISION APPROACH
NAVIGATION ACCURACY Approach guidance ND AP/FD mode
PF PNF
GPS PRIMARY Managed (3)
or Selected ARC or ROSE NAV (1)
with navaid raw data NAV-FPA or
APP-NAV/FINAL (3)
NAV ACCUR HIGH
NAV ACCUR LOW and NAV
ACCURACY checK ≤1 nm
GPS PRIMARY LOST and
NAV ACCUR LOW and NAV
ACCURACY check > 1 nm Selected ROSE VOR (2) ARC or ROSE NAV or ROSE VOR (2) with navaid raw data TRK-FPA
GPS PRIMARY LOST and aircraft flying
within unreliable radio navaid area
(1) For VOR approach, one pilot may select ROSE VOR
(2) For LOC approach, select ROSE ILS
(3) The managed vertical guidance can be used provided the approach coding in the navigation database has been validated.
Should a NAV ACCY DNGRADED or a GPS PRIMARY LOST message is displayed during a managed non-precision approach, the crew should proceed as follow:
Message VOR, ADF, VOR/DME approach GPS approach
GPS PRIMARY LOST Cross-check the navigation accuracy: If positive, continue managed approach
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本文链接地址：A330/A340 机组训练手册 FCTM Flight Crew Training Manual 1(70)
