Mask Up
This nose tube delivers oxygen in GA aircraft at lower altitudes.
What is a cannula?
Under FAR 91.211, the crew may fly 30 minutes without oxygen between 12,500 ft and this cabin altitude.
What is 14,000 ft?
The three particles that make up an atom.
What are protons, neutrons and electrons?
Light aircraft run on DC systems at one of these two voltages.
What are 14 volts and 28 volts?
The electrical system fails completely, but the engine keeps running because of these.
What are the magnetos?
Airliner passenger masks deploy automatically when this rises past a preset value.
What is cabin altitude?
Above this cabin altitude, every occupant must be provided with oxygen.
What is 15,000 ft?
Every complete circuit needs at least these three elements.
What are a source, a load and conductors?
A 28-volt landing light has a 7-ohm lamp. This is the current it draws.
What is 4 amps?
The low-voltage light comes on and the ammeter shows a discharge in cruise. This is what you just lost.
What is the alternator?
Crew members can put on this mask with one hand in seconds.
What is a quick-donning mask?
This installation is built into the airplane: heavy, but long-lasting.
What is a fixed oxygen system?
In a series circuit, current through every component is this.
What is the same?
A 50-watt light on a 14-volt airplane draws about this much current, twice what it draws at 28 volts.
What is 3.6 amps?
The pilot’s first move after an alternator failure.
What is shed non-essential electrical load (per the POH)?
A demand regulator gives full service up to this altitude.
What is 35,000 ft?
The three basic components of OBOGS (the On-Board Oxygen Generating System).
Board Oxygen Generating System).What are the concentrator, oxygen monitor and breathing regulator?
The aircraft and fuel truck are grounded during refueling to prevent this.
What is a static electricity spark (discharge)?
The breaker is still in, but the unit is dead. Ohm’s law says to suspect this fault.
What is an open circuit?
How many times a pilot should reset a popped breaker, and only if it’s needed for flight.
What is once, after it cools (per the POH)?
With smoke in the cockpit, set a diluter-demand regulator to this
What is 100% oxygen?
This mineral in the OBOGS sieve beds pulls nitrogen out of the air.
What is zeolite?
Its symbol is Q, and one of them equals about 6.24 × 10¹⁸ electrons.
What is a coulomb?
A breaker trips and you smell hot insulation. Name the fault and what you do about the breaker.
What is a short circuit, and leave the breaker out (don’t reset it)?
A 35-amp-hour battery carrying a 10-amp load lasts about this long.
What is 3.5 hours (in theory; less in practice)?