getting to grips with aircraft performance monitoring(12)

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In order to complement cruise performance analyses, and whenever possible, the aircraft should be observed on ground (to be confirmed with photographs) and in flight for any surface misalignment or other aerodynamic discrepancies such as: -door misrigging (see figure B3) -missing or damaged door seal sections -control surface misrigging (see figure B2) -missing or damaged seal sections on movable surfaces -skin dents and surface roughness
-skin joint filling compound missing or damaged.

Figure B2 - Example of misrigged slat

Figure B3 - Example of misrigged doors
Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring
BACKGROUND

In flight this would specifically pertain to : -slats alignment and seating -pylons and pylon – to – wing interfaces
-  engine cowlings
- spoilers trailing edge seating and seal condition (rubber or brush)
- flaps, flap tabs and all-speed ailerons trailing edge alignment.
On ground this would specifically pertain to most forward and middle areas: -Static and dynamic pitot condition
-Nose radome misalignment -Cargo door to fuselage alignment -Service door condition -Engine fan blade condition (curling,
etc).
- Surface cleanliness (hydraulic fluid, dirt, paint peeling (see figure B4), etc).
- 
 Under-wing condition

-
 Wing-body fairing -Nose and main landing gear door

adjustment -Temporary surface protection remnants.
Figure B5 shows an example of a very unclean aircraft. This parasitic drag assessment shows an estimated amount of 6.09 extra drag count resulting in a 2%-loss of Specific Range.
More details on that subject is available in another Airbus publication “Getting hands on experience with Aerodynamic deterioration” (see Chapter J-Bibliography, document [J-3]).

Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring

BACKGROUND

Figure B5 - Parasitic Drag Assessment example for an A310 aircraft
Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring
23

BACKGROUND
3.4.1.3. Aircraft trimming and asymmetry diagnosis (BIAS)
Accurate and repetitive trimming allows to identify the origin of small but persistent
asymmetries to be identified especially on A300B2/B4 and A310 / A300-600
aircraft.

The reasons for these asymmetries can be several:
-General production tolerances, particularly wing tolerances and asymmetry

between both wings in dimensions, wing / fuselage local setting, wing twist -Control surface rigging tolerances, particularly for rudder, ailerons and spoilers, -Fuel loading asymmetries between both wings, although displayed FQI values
are symmetrical -Thrust setting asymmetries between both engines, although displayed N1 /
EPR values are symmetrical -Cargo or passenger loading asymmetries.
　
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