MEL/DDG Flashcards

Question

What is an Alleviated ETOPS transit check and when and how might it be used?

Answer 1

In the event that an aircraft has to depart from an airfield at which there is no BA approved engineer authorized to conduct an ETOPS Transit Check, the Captain may be authorized to conduct an 'Alleviated ETOPS Transit Check' on authority from Maintrol. The schedule is held onboard in the Aircraft Maintenance Log Part 1 binder. Procedures for recording the check are contained in the Aircraft Maintenance Log User Guide.

Answer 2

There is a flow chart in the DDG under BA Guidance on Status Level Messages. Before engine start the message should be dealt with in co-ordination with Maintrol. After start the process is a little more convoluted and may require application of (O) requirements for the particular defect. Best advice is consult flow chart.

Answer 3

SUBJECT: Optimizing vertical flight path using the FMC in the presence of DDG items with enroute climb penalties REFERENCES: DESCRIPTION: ====================== For the 777 fleet, there are certain DDG items which carry a significant enroute climb penalty, e.g. 30-21-01-01A. Desired Action ====================== Can Boeing please recommend how best to consider penalties like this in the FMC predictions, e.g. for recommended step climbs, optimum/ maximum altitudes and fuel use. RESPONSE: In this case, the term "enroute climb" is not referring to the all engine climb capabilities during the enroute, all engine portion of the flight profile (cruise). The enroute climb penalty is to be applied to the weight limit determined from the AFM enroute, one-engine-inoperative climb performance when considering engine inoperative net level off altitude capability prior to dispatch. The application of the enroute climb penalty during flight planning ensures that the level-off altitude is adequate for terrain clearance along the route and the engine-out altitude capability complies with FAR 121.191. It may be possible that the enroute climb penalty associated with an MEL condition will become a limiting factor in determining the maximum takeoff weight when operating over routes where terrain clearance is an issue. In some cases, the all engine climb capability may be affected as well, for example, an increase in drag associated with a CDL item. However, Boeing does not calculate this specific penalty because the associated takeoff/landing, enroute climb and fuel mileage penalties will be conservative enough to account for this reduction in all engine altitude capability. If British Airways wishes to consider these penalties in FMC predictions, you would need to first determine if the enroute climb penalty (engine inoperative, MCT) is due to something which would also affect the all engine climb capability (all engines, MCRT). Then, a conservative approach would be to use the enroute climb penalty against the altitude capability in flight planning. However, since you will also need to consider the conservative takeoff/landing, enroute climb and fuel mileage penalties, this additional conservative penalty may be overly conservative.

Answer 4

Probably NOT as in most cases repairs are required ex Main Base but it may not be immediately obvious. It also depends on whether pax are carried or not. It also depends on the a/c modification state > pre or post ‘densification’. How do you know if a cabin has been ‘densified’? GO TO DOCUNET > WEIGHT SCHEDULES. It will tell you if an a/c has been densified. You could also refer to Load and Balance > Interior Layouts A 777 Notice was issued in June 21 to reflect that full IFE is NOT required for ops without pax

Answer 5

AML user guide 14.3.1 To be completed before departure ex Main Base (max once in 1 calendar day or stopover). The check remains valid until next Main Base (LHR & LGW) visit. The check is valid for 7 days. It is also valid if the last certified check was completed at a line station and the a/c flies a single sector to Main Base and departs the day it arrives. Only transit check needs to be completed.

Answer 6

Quite a long list and detailed in AML User Guide Sect 14 > Pre-flight. ``` Defects > cleared or deferred Cabin Defects > cleared or deferred ADD’s > correctly actioned and recorded Outstanding ADD’s > meet requirements of upcoming flight Remaining Fuel Figure Incoming Capt signature Oil and Hydraulics completed and levels acceptable Daily Check/ETOPS Transit Check ```

Answer 7

ADD Type Code ‘I’ is surveillance of a defect or inspection associated with a defect. They require repetitive assessment at an interval greater than the Daily Check.

Answer 8

The timings will be detailed in the AML > Controlled Inspections (Blue Pages)

Answer 9

AML User Guide Section 14 > Transit Check MUST be performed prior to each departure. The User Guide specifically states “If a/c night stops as result of a delay or RETURN TO STAND the Transit check must be completed on the departure stand as close as practical to the departure time. So, if night stopping “Yes” if not “No”.

Answer 10

Performance ADDs and will have an associated “O” or “P” action in DDG

Answer 11

That action taken is relevant to the defect raised. It must contain details of any limitations, perf penalties, maintenance actions etc.

Answer 12

Where an (O) or (P) symbol is annotated in the DDG or where the defect directly affects the Flight Crew.