Lighting the Way!
Apr11
“There are darknesses in life and there are lights, and you are one of the lights, the light of all lights.”
― Bram Stoker, Dracula
The Enigma of Aircraft Lights
Gene Wentzel, ATP, CFII
It is 12 noon, the 25 hour student pilot and I have just cleared the runway and they are completing the after landing checklist. They are at the part that says, “Lights ……As Required”.
I know what’s coming…I see them read it…they hesitate…I see the cognitive wheels revolving as they noodle through this seemingly innocuous declaration. They bring their tentative finger slowly over to the landing light switch; it hovers over the control for what seems an eternity. It’s almost as if they feel making the wrong choice will advance the Hobbs meter by 0.5. They next look at me confused and inquire, “Should I turn the landing light off?”
I always give them the answer and provide a rationale for why they should be turned off or left on. They will be even more confused if strobes are involved. The cruise checklist (which, by the way, doesn’t even mention strobes) simply states, “Landing and Taxi Lights…..Off” and will cause the student to reach over and reflexively turn off both the landing light and the strobes!
I reviewed this issue with another flight instructor. I asked him if he has the same situation come up, and if so, what he does about it. He explained, “I just ask them to answer 2 questions:
- Do you need the lights to see?
- Or
- Do you need the lights to be seen?”
These are easy and logical questions and I have been utilizing this approach when training my students, but with varying results. Therefore, let’s go over how we should utilize the lighting systems of our aircraft and why.
Aircraft certificated with an electrical system and have installed lighting systems typically include all or some the following:
- Position lights (aka navigation or nav lights)
- Primary Anti-collision light (usually the beacon)
- Landing / Taxi lights
- Strobes (usually supplementary anti-collision lighting)
Some of these lights and their use are regulated by the FAA; others systems are operated by either common sense or personal preference. Ok, let’s get started…
- Position lights: these are required by regulation to be used while operating on the ground or in the air after sunset and left on until engine shutdown or up to sunrise. Therefore, during the day they are OFF.
- Primary Anti-collision light, such as the beacon, are required to be used during all types of operations (day or night). If the master switch is on, so is the beacon. Closer to the truth, the beacon light switch is ON, period! End of story! Barring a small beacon electrical fire, DON’T TOUCH IT! Personally, the beacon shouldn’t even have a switch; it should only have a circuit breaker that can be pulled, but I digress.
- Landing / Taxi lights: This is where there is some confusion and personal preference.
- First, if an aircraft has both a landing and taxi light, consider them one light and one switch. They are either both on or they are both off. There is rarely a need to have one on and the other off.
- My advice is that EVERY take-off and EVERY landing has both landing and taxi lights on (day or night). At night we need them TO SEE and TO BE SEEN and during the day we need them TO BE SEEN.
- After landing, if it is daytime, turn them off. We don’t need them TO SEE and we don’t need them TO BE SEEN.
- After landing, if it is nighttime, leave them on. We need them TO SEE and we need them TO BE SEEN. Turn them off ONLY if they might cause a distraction to another pilot, especially if they are taking-off or landing.
- There is a regulation to have a landing light, but that is only for aircraft utilized at night for commercial operations.
- In cruise flight there is some personal preference that can be afforded.
- Some pilots always turn them off and others leave them on.
- There is a recommendation from the FAA to leave landing lights on below 10,000 feet, but this does not appear to be universally adopted or practiced in general aviation.
- Since the advent of LED lighting many pilots choose to just leave them on (day or night). These lights use less power, produces less heat, provides more light, and they last for 10’s of thousands of hours, so the attitude is, “What the heck, just leave them on TO BE SEEN.”
- Strobes:
- Strobes are another form of anti-collision light and usually supplementary to a beacon.
- They should be turned on prior to entering a runway for any reason and left on until completely clear of a runway TO BE SEEN, day or night.
- They should be turned on prior to take-off TO BE SEEN.
- They should be left on in cruise flight TO BE SEEN…
- …but, they should be turned off in flight if determined by the PIC that they constitute a hazard to safety due to adverse meteorological conditions. (14 CFR Section 91.209).
- They should be turned off after landing and clear of the runway so not to distract other pilots or ground personnel.
I hope this helps illuminate the uses of aircraft lighting in the different phases of ground and air operations. If you have any questions, discuss it with any flight instructor.
Gene Wentzel, ATP, CFII
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April 15th, 2018 at 2:46 pm
Nice!
Could use a brief note on the difference between landing and taxi lights so that the pilot can efficiently apply your two questions (to see, to be seen): The bulbs are the same. Landing light face out, taxi light faces the ground. (Everyone will learn this quickly on the first night landing where the taxi light was left off!)
It’s also probably why you suggested taxi light on during the day, on approach. Good idea.. I haven’t considered that angle.