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Flashcards in Alternates Deck (12):
1

What is the mnemonic?

1-2-3 / 1500 + 2 / 2000 + 3 / MMOISTRS / 3585

2

1-2-3

The basic 1-2-3 rule: 1 hour before to 1 hour after ETA, ceilings 2,000 or more, vis 3 SM or more.

3

1500 + 2 / 2000 + 3

For flag operations, 1500 feet / 2 miles above lowest approach mins, or 2,000 AFE / 3 miles, whichever is greater.

4

M (1st)

Marginal:

  • within 100 OR ½ of Cat 1 mins at destination
  • AND within 100 OR ½ of DERIVED mins at 1st alternate
  • then 2nd alternate required.

5

M (2nd)

Method 2 Engine failure at cruise, clear all obstacles by 2,000 feet, 5 SM either side of route — but if failure occurs before reaching cruising alt, we need to be able to return to departure airport, or divert to a takeoff alternate using Method 1 calculations.

6

O

Offline charters

7

I

International

8

S (1st)

Severe icing

9

T

Thunderstorms

10

R

RNAV only

11

S (2nd)

Supplemental

12

3585

3585

  • destination = not less than ½ the vis for the expected approach
  • 1st alternate = not less than ½ the DERIVED ceiling AND vis
  • 2nd alternate = at or above DERIVED mins