References: Main landing gear door mis-rig
MPD Task Reference: ZL-733-01-1 MPD Task Interval: every 100 days Estimated inspection time (all doors): 15 minutes (plus aircraft jacking for fairings) Estimated re-rig time: 20 man-hours AMM Reference: 32-12-11/13/14 PB401
Figure 3-26
Main Landing Gear Door mis-rig of 10 mm (A320*)
While inspecting the alignment of the landing gear doors, the opportunity to check the condition and effectiveness of their seals should also be taken.
3.2.5.3.7. Door seals
The passenger and cargo bay door seals serve a dual function. These seals not only fill the gap between the door and its surrounding structure but they also render the door airtight. This allows the aircraft to be pressurized efficiently. A damaged, leaking seal allows pressurized cabin air to escape in a direction perpendicular to the fuselage skin. The effect on the local airflow can be quite significant. The actual resulting aerodynamic deterioration is similar to that seen when a flap or spoiler seal is missing so the fuel burn penalty can be seen on the charts on page 38. The references are shown below.
References: leaking passenger or cargo bay door seal
MPD Task Reference (passenger doors): ZL-831-01-1 MPD Task Reference (cargo doors): ZL-825-01-1 and ZL-826-01-1 MPD Task Interval: every 100 days Estimated inspection time (all doors): 1 man-hour plus access Estimated replacement time (pax door seal): 4 man-hours AMM Reference: Passenger Door Fwd: 52-11-18 PB 401 & Aft: 52-13-18 PB 401 Estimated replacement time (cargo door seal): 8 man-hours AMM Reference: Cargo Door Fwd 52-31-18 PB 401 & Aft: 52-32-18 PB 401
3.2.5.3.8. Paint Condition
Deterioration of the aircraft’s exterior surface is to be expected on any aircraft in service. The rate of deterioration can vary with the intensity of the utilization and environmental conditions. Although the thickness of paint is typically around 1/3 millimeter its loss in critical areas of the airframe will upset the local airflow to an extent that overall drag can be increased. Particular attention should be paid to the nose and cockpit area and the wing upper and lower surfaces.
US$5,000
*Figures represent additional fuel burn
and cost for an A320 aircraft.
For A318, A319 and A321 the factors
shown on page 33 should be applied.
Typical Paint Peeling
Data - Mission A Upper Wing Lower Wing Nose
Annual cycles: 1800
Annual Flight Hours: 2700
Average sector length (Hours): 1.5
Additional fuel per sector -A320* (KGs): 10 5 5
Data - Mission B
Annual cycles: 1500
Annual Flight Hours: 3000
Average sector length (Hours): 2
Additional fuel per sector -A320* (KGs): 11 5 5
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