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An aircraft being operated for a Commercial Air Transport flight has an Approach Climb Gradient (ACG) capability of 3.7%. Three instrument approach procedures are available and listed below. Which of these could be selected for that flight?

1. ILS/DME APP, minimum ACG required is 3.0%
2. LOC/DME APP, minimum ACG required is 3.7%
3. VOR/DME APP, minimum ACG required is 4.2%

  • A
    2 only
  • B
    1 only
  • C

    2 or 3

  • D
    1 or 2

The missed or discontinued approach is defined as a go-around from at or above decision height (DH) with one engine inoperative. This is also called “approach climb”.

The requirement for Approach climb gradient assures that ''an adequate performance for a go-around exists in the event of an engine failure''.

For instrument approaches the pilot should verify that the Approach Climb Gradient (ACG) capability allows for a missed approach. Therefore, the selected instrument approach procedure must have a minimum ACG requirement equal or less than the aircraft’s ACG capability.

For an ACG capability of 3.7%, the only instrument procedures that assure a safe missed approach are those with a minimum ACG equal or less than 3.7%.

Therefore, only 1.ILS/DME APP or 2.LOC/DME APP can be selected, which require minimum ACG capability 3.0% and 3.7% correspondingly.

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