Altimeter Descent Instrument Landing System 
Pilot Institute
JANUARY 27, 2025
To understand why the six primary instruments look the way they do, you need to have a basic understanding of how they function. The six primary instruments (the six-pack) are the Attitude Indicator (AI), Heading Indicator (HI), Turn Coordinator, Airspeed Indicator, Altimeter, and the Vertical Speed Indicator (VSI).
Pilot Institute
FEBRUARY 15, 2025
Theyre especially useful for airports that dont have the budget or suitable terrain to install an Instrument Landing System (ILS). This makes more airports accessible under Instrument Flight Rules (IFR). Instead of a Decision Height (DH), youll use something called a Minimum Descent Altitude (MDA). Thats up to you!
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