Night Emergencies

10.night-emergencies. Night Emergencies

Emergencies at night present unique challenges because visual references are degraded or absent, terrain and obstacles cannot be seen until illuminated by aircraft lights, and pilot workload is compounded by the additional task of operating in darkness. The keys to successfully managing a night emergency are sound preflight planning, thorough knowledge of the airplane's systems, disciplined use of checklists, and the ability to fly the airplane on instruments if outside visual references are lost.

Common Night Emergencies

• Engine failure or partial power loss
• Electrical system failure (alternator/generator failure, battery depletion)
• Loss of cockpit or instrument lighting
• Landing light failure
• Spatial disorientation
• Inadvertent flight into instrument meteorological conditions (IMC)
• Becoming lost or disoriented

Engine Failure at Night

If the engine fails at night, the pilot must accomplish essentially the same tasks as during a daytime engine failure, but with reduced ability to evaluate the terrain below. The procedure is:

1. Establish best glide speed immediately and trim for it.
2. Turn toward the nearest suitable airport or lighted area. Lighted runways, highways, and populated areas offer the best chance of identifying a usable surface.
3. Attempt a restart using the engine failure checklist (fuel selector, mixture, primer locked, magnetos, carburetor heat, electric fuel pump as appropriate).
4. Declare an emergency on 121.5 MHz or the appropriate ATC frequency, squawk 7700, and use the cabin lights and exterior lights to aid SAR if needed.
5. Secure the engine if a restart is unsuccessful (mixture idle cutoff, fuel selector OFF, magnetos OFF, master OFF just prior to touchdown to reduce fire risk).
6. Turn on the landing light at approximately 200 feet AGL. If the terrain visible in the landing light is unsuitable, turn the light off — what cannot be seen often produces a less violent impact than what can be.

If no lighted area is reachable, plan a descent into the darkest area away from clusters of lights — clusters often indicate towns or obstructions, while dark areas are usually open terrain or fields. Maintain best glide, configure for landing, and accept the touchdown with wings level and minimum forward speed consistent with controllability.

Electrical System Failure

A total electrical failure at night is potentially serious because it eliminates radios, navigation equipment, position lights, and most cockpit lighting. If an alternator failure is detected (low voltage light, ammeter discharge), the pilot should:

• Reduce electrical load by turning off nonessential equipment.
• Attempt to reset the alternator per the POH.
• If unsuccessful, plan to land at the nearest suitable airport while battery power remains.
• Use a flashlight to read instruments and charts; every night flight should include at least one reliable flashlight (preferably with a red or blue-green lens to preserve night vision) plus a backup.

Loss of Cockpit Lighting

If cockpit lighting fails, immediately use a flashlight. This is why a serviceable flashlight is required equipment for any night flight and is referenced in 14 CFR 91.205(c) for night VFR (a flashlight with at least one spare set of batteries if equipped with electric position lights powered by the airplane's electrical system — see the regulation for the precise wording).

Spatial Disorientation and Inadvertent IMC

At night, especially over unlighted terrain or water, the natural horizon may be indistinguishable from the sky. Pilots are vulnerable to somatogravic and somatogyral illusions, false horizons created by sloping cloud tops or shorelines, and the black-hole approach illusion when approaching a lighted runway across unlit terrain — which causes pilots to fly a lower-than-normal approach.

If visual references are lost or the pilot inadvertently enters IMC:

1. Trust the instruments. Establish straight-and-level flight by reference to the attitude indicator.
2. Make a 180° standard-rate turn to exit the conditions, using the heading indicator and timing the turn for one minute.
3. Climb if necessary to maintain terrain clearance.
4. Contact ATC for assistance — they can provide vectors, altitude assignments, and clearances.

Becoming Lost

At night, ground references familiar by day may be unrecognizable. If position is uncertain, climb to improve radio and navaid reception, identify a prominent lighted feature (rotating beacons, highways, cities), tune the nearest VOR or use GPS, and contact ATC. Squawk 7700 and transmit on 121.5 MHz if truly lost or low on fuel.

Risk Mitigation

The best response to a night emergency is preventing one. Carry adequate fuel reserves (the FAA recommends more than the legal minimum at night), file a flight plan, plan a route over lighted terrain when practical, brief yourself on alternate airports along the route, and maintain proficiency in instrument flying. Two flashlights, current charts, and a thorough preflight inspection — including all aircraft lighting — are baseline expectations for any night flight.