ATOMATOFLAMES, GRABCARD, and the Airworthiness Decision Tree Every Pilot Has to Know Before They Leave the Ground

FAR 91.205 defines the minimum instruments and equipment required for legal flight under VFR and IFR. The mnemonics ATOMATOFLAMES, FLAPS, and GRABCARD map to the three tiers of requirements - day VFR, night VFR, and IFR - and a separate regulation, FAR 91.213, governs what happens when one of those items stops working.

What Does ATOMATOFLAMES Stand For?

ATOMATOFLAMES covers the thirteen items required for day VFR flight. These aren’t arbitrary bureaucratic entries - each one appears on this list because aviation accident history demonstrated what happens when it’s absent or ignored.

A - Airspeed Indicator. Tells you how fast air is moving over the wings. Without it, you’re guessing at stall speed, flap extension limits, and never-exceed speed.

T - Tachometer (one per engine). In fixed-pitch propeller aircraft, the tach sets power for every phase of flight and serves as an early indicator of engine performance problems.

O - Oil Pressure Gauge (one per engine using pressure lubrication). Oil pressure indicates the engine is lubricated and circulating. A drop in pressure is an early warning - often the last warning before internal engine damage begins.

M - Manifold Pressure Gauge. Required only for engines with altitude-controlled or supercharged induction. Most carbureted training aircraft - Cessna 172s, Piper Cherokees, Diamond DA20s - don’t need this. Step into a turbocharged aircraft, and manifold pressure becomes a primary power control input.

A - Altimeter. Your vertical position reference. Without an accurate altimeter, terrain separation, altitude compliance, and airspace avoidance all become guesswork.

T - Temperature Gauge for liquid-cooled engines. Situational. Most GA training aircraft are air-cooled, so this one may not apply. If your aircraft has a liquid-cooling system, this gauge is monitoring an active thermal loop - ignore it at significant cost.

O - Oil Temperature Gauge. This is a separate requirement from oil pressure. Pressure tells you oil is flowing; temperature tells you how hot it’s running. Hot oil loses viscosity and protective capacity. Both gauges are required, and both matter.

F - Fuel Gauge (one per fuel tank, not one total). The regulation is specific: one indicator per tank. In multi-tank aircraft with manual fuel management, partial fuel information has contributed to fuel exhaustion accidents. Individual tank gauges exist for exactly that reason.

L - Landing Gear Position Indicator. Required only on aircraft with retractable gear. In a Beechcraft Bonanza, Piper Arrow, or Mooney, the gear position indicator is what separates a normal landing from a gear-up event.

A - Anticollision Lights. Required on aircraft certificated after March 11, 1996. Aircraft manufactured before that date aren’t required to have them under this rule, though many do. For anything modern, the strobe system or rotating beacon is a required item.

M - Magnetic Direction Indicator. The compass. No electricity required, no moving parts to fail conventionally. It points north. Under VFR it is simultaneously the simplest instrument in the cockpit and one of the most fundamentally important.

E - Emergency Locator Transmitter (ELT). Designed to activate automatically in a crash and transmit your location to search and rescue. 406 MHz units now interface with modern satellite rescue systems and are replacing older 121.5 MHz units. Battery replacement is tied to flight hours and calendar time. You need one, it needs to be functional, and you need to know where it is.

S - Safety Belts. One for every person on board. No exceptions.

What Equipment Is Added for Night VFR? (FLAPS)

Night VFR adds five items to the day VFR list, captured in the mnemonic FLAPS.

F - Fuses. One spare set, or at least three spare fuses of each type used in the aircraft. Many modern aircraft use resettable circuit breakers rather than fuses, which changes how this requirement applies in practice - know your aircraft’s electrical protection configuration.

L - Landing Light, but only if the aircraft is operated for hire. A student on a night solo cross-country in a rented aircraft has no legal requirement for a working landing light. A commercial pilot carrying fare-paying passengers does.

A - Anticollision Lights. Already required on post-1996 aircraft for day VFR; explicitly required at night for all aircraft.

P - Position Lights. Nav lights: red on the left wingtip, green on the right, white on the tail. These lights communicate your direction of travel to converging traffic. Required any time you fly after official sunset.

S - Adequate Source of Electrical Energy to power all required electrical equipment for the operation. Night flight creates a dramatically higher electrical dependency than daytime. Plan for what happens if that source is interrupted.

What Does GRABCARD Add for IFR Flight?

IFR flight carries both the day VFR and night VFR lists simultaneously, plus the eight items in GRABCARD.

G - Generator or Alternator. IFR operations depend on continuous electrical power. A reliable generation source that can sustain your avionics, lights, and instruments for the full flight is required.

R - Radio. Two-way communications equipment appropriate for the route flown, plus navigation equipment sufficient to navigate the planned route. If the routing requires a VOR, that VOR must be working before you enter IMC.

A - Sensitive, Adjustable Altimeter. Not just any altimeter - one that can be set to the current altimeter setting. “Sensitive” carries regulatory weight here: it refers to a barometric altimeter with an adjustable Kollsman window.

B - Ball. The slip-skid indicator. No electrical dependency, no gyro to precess. It tells you whether the flight is coordinated, and in IMC, that simple truth matters.

C - Clock with hours, minutes, and seconds, and either a sweep second hand or digital display. Timing is embedded throughout instrument procedures - holding entries, timed approaches, missed approach points. Accurate time, readable at a glance, is required.

A - Attitude Indicator. The artificial horizon that replaces the actual horizon you can no longer see. The cornerstone of the IFR instrument scan. Everything else orbits around it.

R - Rate of Turn Indicator. The turn coordinator or turn-and-bank indicator. Provides standard rate turn information and serves as partial panel backup if the attitude indicator fails.

D - Distance Measuring Equipment (DME) or RNAV equivalent, required only when operating at or above Flight Level 240 where VOR navigation would otherwise require DME. Most general aviation IFR flying at lower altitudes doesn’t trigger this requirement - but know the threshold.

How Do You Decide If You Can Fly with a Broken Instrument?

When equipment is inoperative, FAR 91.213 is the governing regulation. Work through this decision tree in order.

Step 1: Does the aircraft have an FAA-approved Minimum Equipment List (MEL)? An MEL is an aircraft-specific document that identifies which items can be inoperative, under what conditions, and what actions are required. Airline and charter aircraft almost always have one. Most small GA aircraft do not. If there’s no MEL, go to step two.

Step 2: Does the POH or type certificate data sheet include a Kind of Operations Equipment List (KOEL)? If the broken item appears on the KOEL as non-required for airworthiness, and has been properly deactivated and placarded “INOPERATIVE,” you may be legal to fly - provided that item isn’t required for the specific operation you’re planning.

Step 3: Is the inoperative item required for the flight you’re planning? This is where 91.205 comes back in. If the broken instrument appears on the applicable list for your operation - day VFR, night VFR, or IFR - and steps one and two haven’t cleared you, the aircraft is not airworthy. You do not fly.

Why Does the Same Broken Instrument Have Different Answers?

Context determines legality. A broken clock on a day VFR local flight doesn’t appear on the ATOMATOFLAMES list - that flight may be legal. The same broken clock on an IFR flight plan grounds the airplane, because timing is embedded throughout instrument procedures.

The same broken instrument. Two completely different answers depending on the operation. This is why memorizing the list isn’t enough - you have to understand what each item is required for and under what conditions.

What If the Equipment Is Legal to Remove but Something Still Feels Wrong?

Regulations establish a floor. Pilot judgment establishes the ceiling. A malfunctioning attitude indicator that’s giving false readings on the ground is providing that information for a reason. A flight that technically clears the regulatory minimum is not automatically a sound decision.

Schedule pressure is where this calculus gets dangerous. The weather looks reasonable, the flight is short, and something isn’t quite right on the airplane. That’s when reasoning starts to bend - “it’s probably fine,” “we’ll be extra careful.” Every item on the ATOMATOFLAMES list exists because accident history showed what its absence cost. These are lessons distilled from bad days, not line items to clear so you can get moving.

The process exists. Use it.

Key Takeaways

• ATOMATOFLAMES covers 13 required items for day VFR flight under FAR 91.205; FLAPS adds night VFR requirements; GRABCARD adds IFR requirements - and all three lists stack.
• Oil pressure and oil temperature are two separate gauges measuring two different things; both are required.
• FAR 91.213 provides the decision tree for inoperative equipment: MEL first, then KOEL, then determine whether the item is required for the planned operation.
• The same inoperative instrument can produce different legal answers depending on whether the flight is day VFR, night VFR, or IFR - context is everything.
• Legal and safe are not the same standard. The regulations define the minimum; your judgment defines whether you should actually go.