The Six-Pack: The Six Flight Instruments Every Pilot Reads First

The “six pack” is the standard layout of six primary flight instruments found on most light aircraft: the airspeed indicator, attitude indicator, altimeter, turn coordinator, heading indicator, and vertical speed indicator. Arranged in two rows of three, they tell you how fast, how high, which way, and whether you’re climbing, descending, turning, or flying straight and level.

Climb into almost any Cessna, Piper, or Diamond trainer built before the glass-cockpit era and you’ll see them — six round dials clustered front and center, right where your eyes naturally fall. Pilots have called them the “six pack” for decades because of that two-by-three arrangement, like a six pack of soda. They’re the instruments you scan first, trust most, and fall back on when everything fancier quits. Below, we cover all six: what each one shows, what physics drives it behind the panel, how they’re grouped, and why this exact layout became the standard. We keep it grounded in how the instruments actually work, because that understanding is what lets you catch one when it lies to you.

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What are the six-pack instruments?

The six-pack instruments are the six primary flight instruments used to fly a light aircraft by reference to the panel: the airspeed indicator, attitude indicator, altimeter, turn coordinator, heading indicator, and vertical speed indicator. Together they answer the basic questions of flight — how fast you’re going, what attitude the airplane is in, how high you are, whether you’re turning, which direction you’re pointed, and whether you’re climbing or descending.

Here’s the quick tour. The airspeed indicator shows your speed through the air. The attitude indicator — the artificial horizon — shows your pitch and bank at a glance, the closest thing on the panel to looking out the window. The altimeter shows your altitude above a pressure reference. The turn coordinator shows your rate of turn and whether the turn is coordinated. The heading indicator shows your magnetic heading on a stable card. And the vertical speed indicator (VSI) shows how fast you’re going up or down in feet per minute.

You don’t read them one at a time. Pilots run a continuous instrument scan, eyes flowing across the cluster so no single instrument goes unwatched for long. The layout, as you’ll see next, is built to make that scan fast.

How are the six instruments arranged on the panel?

The six pack is arranged in two rows of three, and the order is standardized so a pilot can move between aircraft and find the same instrument in the same spot. The top row, left to right, is airspeed indicator, attitude indicator, altimeter. The bottom row, left to right, is turn coordinator, heading indicator, vertical speed indicator.

That arrangement forms what the FAA calls the basic-T. The four most important instruments sit in a cross: the attitude indicator on top center, the airspeed indicator to its left, the altimeter to its right, and the heading indicator directly below it. Pitch and bank in the middle, speed on the left, altitude on the right, direction on the bottom — your eyes can sweep the T in a fraction of a second.

The attitude indicator earns the center spot because it’s the master reference for flying without an outside horizon — set pitch and bank there, and the other five instruments confirm the result. Standardizing this layout means muscle memory transfers between airplanes, which matters when you’re task-saturated and reaching for an instrument without looking.

Which six-pack instruments run on the pitot-static system?

Three of the six instruments run on the pitot-static system, which uses air pressure rather than electricity: the airspeed indicator, the altimeter, and the vertical speed indicator. Per the FAA Pilot’s Handbook of Aeronautical Knowledge (PHAK, FAA-H-8083-25C), this system feeds ram (impact) air pressure from the pitot tube and still (ambient) air pressure from the static port to these three mechanical instruments.

The division of labor is worth memorizing because it explains every failure you’ll study. The airspeed indicator is the only instrument that uses both pitot and static pressure — it measures the difference between them. The altimeter and the VSI use static pressure alone. So a blocked pitot tube wrecks only your airspeed, while a blocked static port can throw off all three pitot-static instruments at once.

Because they’re purely mechanical, these three keep working through a total electrical failure. The one exception is pitot heat — the electric element that keeps ice out of the pitot tube — but the instruments themselves need no battery, alternator, or avionics bus to function.

Which six-pack instruments are gyroscopic?

The other three instruments are gyroscopic — they rely on a spinning gyroscope to hold a stable reference. These are the attitude indicator, the heading indicator, and the turn coordinator. Per the FAA Pilot’s Handbook (PHAK, FAA-H-8083-25C), a spinning rotor resists changes to the plane of its spin (rigidity in space), and that stability is what each of these instruments measures against.

Each gyro instrument uses that property differently. The attitude indicator keeps its gyro level with the earth so the little airplane on the face shows true pitch and bank. The heading indicator uses a gyro to hold a steady directional reference — steadier than the magnetic compass, which swings and lags in turns — so you periodically realign it to the compass in straight-and-level flight. The turn coordinator senses both rate of turn and yaw, with the inclinometer ball below it showing whether the turn is coordinated.

Powering those gyros is the part most students miss. On a typical light trainer, the attitude indicator and heading indicator are driven by an engine-driven vacuum pump that pulls air across the rotor to spin it, while the turn coordinator is usually electric. That split is a safety feature: if the vacuum pump fails, you lose attitude and heading, but the electric turn coordinator survives — and vice versa on an electrical failure. Knowing which instrument runs on which source tells you instantly which readings to trust when something quits.

Why is it called the six pack?

It’s called the six pack simply because of the shape: six round instruments arranged in two rows of three, which looks like a six pack of cans or bottles. The nickname is pilot slang, not an official FAA term — the agency refers to “flight instruments” and the basic-T layout — but it stuck because it’s a perfect, instantly memorable description of what you’re looking at.

The term took hold during the long era when nearly every general-aviation airplane shared this analog layout. From the mid-twentieth century until glass cockpits arrived in the 2000s, the six pack was simply what an instrument panel looked like, and the slang became universal across flight schools and hangars.

The name matters less than the idea behind it: a small, standardized set of instruments that, together, give you a complete picture of the aircraft’s state. If you’re learning to fly, getting the six pack rock-solid pays off on every flight after — it’s the foundation the Angle of Attack Private Pilot Ground School is built around, teaching the “why” behind every gauge so the scan becomes second nature instead of a memorized list.

How is the six pack different from a glass cockpit?

The six pack uses six separate mechanical instruments, while a glass cockpit displays the same information electronically on one or two flat screens called a primary flight display (PFD). The data is identical — airspeed, attitude, altitude, heading, vertical speed, turn and bank — but the glass cockpit paints it digitally and pulls it from solid-state sensors (an attitude and heading reference system, or AHRS, and an air data computer) instead of spinning gyros and pressure diaphragms.

Each approach has trade-offs. The six pack is simple, independent, and fails one instrument at a time — lose a vacuum pump and you still have your pitot-static instruments and electric turn coordinator. A glass PFD is easier to scan, integrates more data, and is highly reliable, but a display or sensor failure can take several readings at once, which is why glass aircraft carry backup instruments.

For a student pilot, the point is this: the six pack is not obsolete knowledge. The six values it shows are exactly what a PFD shows. Learn the six pack and you’ve learned the information behind every panel you’ll ever sit in front of — glass or analog.

Why the scan matters more than any single gauge

Here’s the drill every instructor eventually runs on a student, because it makes the six pack click better than any lecture: cover the attitude indicator.

Picture a 172 in the evening, flying straight and level. The scan is moving the way it should — airspeed, attitude, altimeter, back to attitude, heading, VSI, back to attitude. Smooth and boring. Then the instructor reaches over and quietly drops a sticky note over the attitude indicator. The master reference in the center, gone.

A pilot who fixates is now in trouble. A pilot who keeps the scan flowing is not. Airspeed steady, altimeter holding, heading not drifting, VSI parked near zero, turn coordinator wings level — the airplane’s attitude can be rebuilt from the five supporting instruments, and heading and altitude held without ever touching the one that’s covered.

That’s the whole point of the six pack. It isn’t six gauges read in isolation — it’s a system where any one instrument can quit and the others still tell you the truth, as long as you know how they work and which ones share a power source. Build the relationships between them on a calm evening, and they’re there when the weather, the workload, or a dead vacuum pump says otherwise.

PLT Study Guide

The FAA tags missed knowledge-test questions with Learning Statement (PLT) codes so you know exactly what to review. For the six-pack flight instruments, these are the codes whose official FAA wording matches this material. (Heads up: PLT168 is “angle of attack — characteristics, forces, principles,” which is an aerodynamics code about the angle of attack itself, not a cockpit-instrument code. It doesn’t apply to the six pack, so don’t go chasing it here.)

PLT278 — Recall indicating systems: airspeed, angle of attack, attitude, heading, manifold pressure, synchro, EGT.
The broadest code for this topic. It covers the airspeed, attitude, and heading indicating systems directly — three of your six instruments. Know what each one displays and the physical principle that drives it.

PLT118 — Recall aircraft instruments: gyroscopic.
The core code for the three gyro instruments — attitude indicator, heading indicator, and turn coordinator. Know that they rely on a spinning gyro’s rigidity in space, how they’re typically powered (vacuum for attitude and heading, electric for the turn coordinator), and what each one tells you.

PLT337 — Recall pitot-static system: components, operating principles, characteristics.
Covers the three pressure-driven instruments — airspeed indicator, altimeter, and VSI. Know that pitot supplies ram pressure, static supplies ambient pressure, the airspeed indicator uses both while the altimeter and VSI use static alone, and how a blockage affects each.

PLT167 — Recall altimeters: characteristics, accuracy.
The altimeter is the static-only instrument you’ll see questioned most directly. Know how it senses pressure altitude, why the barometric setting matters, and how a blocked static source changes its accuracy.

Frequently Asked Questions

FROM CHRIS

The six pack looks like a lot to take in — six dials, two power systems, a dozen failure modes. But it’s really one idea: a small, standardized set of instruments that together tell you everything about how the airplane is moving, with enough overlap that no single failure leaves you blind. Learn how each one works and which system drives it, and the scan stops being a chore and becomes the way you feel the airplane through the panel. Master the small stuff, and the big stuff takes care of itself.

Throttle On!

Chris Palmer

Founder & Chief CFI, Angle of Attack — Two-Time Master Aviation Educator and Gold Seal CFI