A318/A319/A320/A321 机组训练手册 FCTM Flight Crew Training Manual(127)_航空信息_民用航空_通用航空

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‐ The Additional factor (when applicable), given by the APPRoach CORrection.
This actual landing distance following a failure is computed with no safety margin.
The flight crew checks this actual landing distance against the Landing Distance Available (LDA) of the runway used for landing applying the relevant safety margins.
The safety margins to be applied depend of the circumstances according to:
? the Captain judgement
? the Airline policy
? the applicable regulations
Note: For example:
The US-FAA recommends to apply a minimum safety margin of 15 % between the actual landing distance and the Landing Distance Available (LDA) in case of
? in-flight determination of the landing distance
? normal and abnormal conditions (except in an emergency)
Ref: US-FAA SAFO 06012 dated 31 Aug 2006.

ABNORMAL OPERATIONS
GENERAL
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL

3 DRY OR WET OR CONTAMINATED RUNWAY
Landing distance with failure = Landing distance see (1) x LDG DIST Factor see (2) x Additional factor (if applicable) see (3)
(1) Landing distance from the LANDING DISTANCE WITHOUT AUTOBRAKE – CONFIGURATION FULL (QRH part 4 – IN FLIGHT PERFORMANCE).
When applicable, correct this landing distance taking into account: ‐ Airport elevation, and
‐ Tailwind.
Do not take into account the correction applicable to all reversers operative whatever the runway state and the reversers' selection at landing.
(2) LDG DIST Factor from:
‐ The LDG CONF/APPR SPD/LDG DIST ON DRY RUNWAYS FOLLOWING FAILURES table (QRH part 2 - ABNORMAL PROCEDURES), or
‐ The LDG CONF/APPR SPD/LDG DIST ON WET RUNWAYS FOLLOWING FAILURES table (QRH part 2 - ABNORMAL PROCEDURES), or
‐ The LDG CONF/APPR SPD/LDG DIST ON CONTAMINATED RUNWAYS FOLLOWING FAILURES table (QRH part 2 - ABNORMAL PROCEDURES).
For each runway state, the two following types of LDG DIST Factors are available: ‐ LDG DIST Factors without reversers, and
‐ LDG DIST Factors with reversers.
Use of LDG DIST Factors is detailed in QRH part 2 - ABNORMAL PROCEDURES - USE OF THE TABLES (PREVIOUS PAGES).
When applicable, AIRBUS recommends using the LDG DIST Factor that minimizes the landing distance with failure.
(3) Additional factor (if applicable) from the VAPP Calculation in the case of an ABNORMAL / EMERGENCY Configuration (QRH part 2 - ABNORMAL PROCEDURES).
Note: if ΔVREF ≤ 10 kt, an additional factor of 1.1 is applicable when:
‐ A/THR is used, or
‐ ice accretion is encountered, or ‐ both.
This additional factor becomes 1.2 when landing in CONF 3 with ice accretion.