ATA 28 FUEL SYSTEM

LEGEND

Procedures Required

(O) – An operational procedure
(M) or (M#) – A maintenance procedure
(O)(M) or (O)(M#) – Both operational and maintenance procedures

Repair Interval Categories

Category A

Items in this category shall be repaired within the time interval specified in the "Remarks or Exceptions" column of the air operator's approved MEL. Whenever the proviso in the "Remarks or Exceptions" column of the MMEL states cycles or flight time, the time interval begins with the next flight. Whenever the time interval is listed as flight days, the time interval begins on the flight day following the day of discovery.

Time Limited Dispatch - Some MMEL's for aircraft that are equipped with FADEC engines have relief that is subject to time limited dispatch expressed as a specific number of engine hours, and will start in accordance with the times established by the engine manufacturer or as indicated in the remarks column of the MMEL. Time limited relief cannot be extended.

Category B

Items in this category shall be repaired within 3 consecutive calendar days excluding the day of discovery.

Category C

Items in this category shall be repaired within 10 consecutive calendar days, excluding the day of discovery.

Category D

Items in this category shall be repaired within 120 consecutive calendar days, excluding the day of discovery. To be considered for placement in Category D, the item must be of an optional nature, or excess equipment which an air operator may, at his/her discretion, deactivate, remove from or install on an aircraft.

To be approved for Category D, the item must meet the following criteria:

  1. the absence of the item does not adversely affect crew member's workload;
  2. the crew members do not rely on the function of that item on a routine or continuous basis; and,
  3. the crew members' training, subsequent habit patterns and procedures do not rely on the use of that item.

Category D relief will generally not be approved for equipment which is considered to increase the level of safety, even if that equipment is of an optional nature.

ITEM:  28-20-1  MAIN FUEL TANK PUMPS

System and Sequence No. Item Repair
Interval
Category
Number
Installed
Number
required
for
dispatch
Procedures
required
Remarks or Exceptions
Main Fuel Tank Pumps C 4 3  

Not usually permitted to be inoperative for ETOPS beyond 120 minutes but could be justified for a specific airplane.

DISCUSSION:

References:   FAA PL 40 (Rev. 1, 15 Aug. 1997)

Relief may be dependent upon aircraft design/configuration as well as ETOPS requirements.

FAA DifferencesFAA relief is identical to TCCA.

ITEM:  28-20-2  PRESSURE REFUELING SYSTEM

System and Sequence No. Item Repair
Interval
Category
Number
Installed
Number
required
for
dispatch
Procedures
required
Remarks or Exceptions
Pressure Refueling System C 1 0   May be inoperative.

DISCUSSION:

References:  nil

Relief may be dependent upon pressure refueling system design.

FAA  Differences:  FAA relief is identical to TCCA.

ITEM:  28-20-3  FUEL TRANSFER SYSTEM

System and Sequence No. Item Repair
Interval
Category
Number
Installed
Number
required
for
dispatch
Procedures
required
Remarks or Exceptions
Center Tank Fuel Pumps C 2 1   One pump may be inoperative provided tank remains empty.
C 2 1  

One pump may be inoperative provided:

a) Fuel quantity in main tanks is adequate to reach a suitable airport in the event the remaining pump fails,

b) Center tank fuel is included as part of the zero fuel weight,

c) Center tank quantity indication is operative,

d) Effect on airplane balance, in the event fuel cannot be used, is accounted for, and

e) Low PRESS light is operative.

C 2 0  

Both pumps may be inoperative provided:

a) Center tank remains empty, and

b) Center tank quantity indication is operative.

DISCUSSION:

References:  nil

2/0 relief may be permitted but consideration must be given to leakage possibility.

FAA  DifferencesFAA relief is similar on approved MMELsFAA has no Policy Letter but should accept TCCA position.

ITEM:  28-40-1  FUEL TANK INDICATION SYSTEMS

System and Sequence No. Item Repair
Interval
Category
Number
Installed
Number
required
for
dispatch
Procedures
required
Remarks or Exceptions
Fuel Tank Indication Systems C - - (O)(M)

One may be inoperative provided:

a) Fuel quantity and balance is determined by other approved means prior to each flight,

b) Fuel flow indications are operative,

c) The low level warning (if fitted) is operative, and

d) The auto and/or manual balance system is operative.

DISCUSSION:

References:  AWM 525.1305

In general a C category is satisfactory.  However, based on insufficient service experience a category B may be more appropriate.

The (O) should address in flight operations, particularly actions to be taken in the event of an engine failure to ensure the AFM fuel imbalance limitation is observed.

For aircraft equipped with FMS calculated fuel used or fuel flow, this may be considered equivalent to fuel flow indications.  For FMS that use fuel indications to determine performance limits for calculation of speeds, weight limits, and/or centre of gravity calculations, additional AFM limits may be required when dispatching with fuel indicators inoperative.

The fuel indication for an inoperative tank is not required.  For aircraft with only wet wings, i.e. no center tank, consideration should be given to dispatching such that fuel transfer is not required.

Relief has been permitted for a wing tank indication inoperative and fuel in a center tank that must be transferred to the wings.

FAA  Differences:  FAA has no Policy Letter but should accept TCCA position.

ITEM:  28-40-2  FUEL TANK TEMPERATURE INDICATION

System and Sequence No. Item Repair
Interval
Category
Number
Installed
Number
required
for
dispatch
Procedures
required
Remarks or Exceptions
Fuel Tank Temperature Indication C - -   May be inoperative.

DISCUSSION:

References:  nil

Each aircraft will need to be evaluated, as there may be a need to apply a minimum or maximum operating temperature if this indication is not available.  Fuel temperature indications may also be required for systems that use fuel for cooling of other aircraft systems.

FAA  DifferencesFAA may give relief with operating temperature limitations based on the AFM.

ITEM:  28-40-3  FUEL TANK MEASURING STICKS

System and Sequence No. Item Repair
Interval
Category
Number
Installed
Number
required
for
dispatch
Procedures
required
Remarks or Exceptions
Fuel Tank Measuring Sticks C - 0   May be inoperative provided fuel quantity is determined by other approved means.

DISCUSSION:

References:  nil

FAA  Differences:  No FAA PL exists for this item.

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