NCAA Namibia Night Rating Theory cheat sheet

Rods are responsible for scotopic (night) vision, are most sensitive to blue-green light (~507 nm), and are located mainly in the peripheral retina; cones mediate photopic vision and colour discrimination.

Dark adaptation takes about 20–30 minutes for full rod sensitivity; avoid bright white light during this period and use red lighting to preserve adaptation.

The fovea has no rods, so at night look 5–10° off-centre (averted vision) to place images on the rod-rich parafovea.

Night visual acuity is roughly 20/200 or worse; do not rely on central vision for detecting dim objects.

The blind spot is about 15° temporal to the fovea and contains no photoreceptors; scan to compensate.

Autokinesis: a static light appears to move when stared at for more than a few seconds; fixate briefly and then shift gaze to stop the illusion.

Black-hole approach: over a dark featureless surface, the apparent glide path is lower than actual; use the VASI/PAPI or an aiming point to avoid undershooting.

False horizon: sloping cloud or ground lights can be mistaken for the horizon; cross-check with the attitude indicator and heading.

Somogyi effect: bright lights along a runway at night can create the illusion of being higher than actual; check the altimeter and glidepath indications.

Hypoxia symptoms at night include diminished night vision, impaired judgement, and euphoria; night vision deteriorates at cabin altitudes as low as 5,000 ft.

Smoking reduces night vision by elevating carboxyhaemoglobin; avoid smoking for at least 12 hours before night flight.

Alcohol impairs dark adaptation and reaction time; allow at least 8 hours between last drink and flight, and longer for higher doses.

Fatigue degrades vigilance, slows reaction time, and increases error rates; circadian low points occur around 03:00–05:00 and 15:00–17:00 local time.

Sleep debt is cumulative; a single night of reduced sleep can impair performance equivalent to a blood alcohol concentration of 0.05%.

Caffeine can temporarily improve alertness but does not replace sleep; avoid excessive use near planned rest periods.

Dehydration and hunger exacerbate fatigue; maintain hydration and regular meals during night operations.

Medications such as antihistamines and sedatives can cause drowsiness and impaired night vision; check aeromedical approval before use.

Cockpit hypoxia can be insidious at night; use supplemental oxygen when required and monitor oxygen saturation if available.

Navigation lights: red on the left wingtip, green on the right wingtip, white on the tail; they indicate aircraft orientation to other pilots.

Anti-collision lights include red or white strobes and beacons; use them at night to increase conspicuity, but avoid flashing lights that cause distraction or disorientation.

Landing lights improve visibility during takeoff and landing but can cause glare; use them judiciously and dim them when not needed.

Cockpit lighting should be dim and red or filtered to preserve dark adaptation; avoid direct white light on instruments.

Instrument panel floodlights should be adjusted to the lowest level that allows reading; excessive brightness reduces outside visibility.

Map lights and utility lights should be shielded and used sparingly; red filters are preferred.

Check all exterior and interior lights during preflight; a failed light can reduce safety and may be a regulatory requirement.

LED replacements may have different colour temperature and dimming characteristics; verify compatibility with existing dimmers.

Emergency lighting (e.g., exit signs, floor proximity) should be checked for operation before night flight.

Use radio navigation aids (VOR, NDB, GPS) and dead reckoning; visual references are limited at night.

Pilotage at night relies on identifying lit landmarks, towns, and highways; verify against charts.

The magnetic compass is reliable in smooth flight but shows errors in turns and acceleration; use the attitude indicator and heading indicator for primary reference.

Calculate wind correction and groundspeed using TAS and wind forecasts; update with in-flight observations.

Use the aircraft's heading indicator and compass periodically to cross-check; magnetic deviation and variation must be applied.

Flight planning should include alternate airports and fuel reserves for night conditions.

GPS provides accurate position fixing; monitor RAIM or use other navigation aids as backup.

Maintain situational awareness by noting time, heading, and landmarks; avoid fixating on a single instrument.

When unsure of position, climb to a safe altitude and use available navigation aids to re-establish orientation.

Use current aeronautical charts; check effective dates and any night-specific information (e.g., lighting, restricted areas).

Plot a dead reckoning position at regular intervals and compare with visual or radio fixes.

Identify lit features such as towns, highways, and airports; match with chart symbols.

Use VOR radials and DME distances to fix position; cross-check with GPS if available.

At night, unlit obstacles and terrain may be difficult to see; maintain a safe altitude using charted elevations.

Mark the last known position on the chart and estimate drift; use wind correction angle.

Use the chart's maximum elevation figure (MEF) to ensure terrain clearance.

When using GPS, verify the waypoint sequence and track; do not rely solely on one system.

Record position fixes with time and heading to maintain a log.

TAF (Terminal Aerodrome Forecast) provides expected conditions at an aerodrome; check validity, wind, visibility, clouds, and weather phenomena.

Night fog and low stratus are common when temperature approaches dewpoint; monitor temperature-dewpoint spread.

Radiation fog forms on clear, calm nights; it can reduce visibility rapidly.

Use METAR for current conditions and trend forecasts for expected changes.

Check for forecast icing, turbulence, and low-level wind shear; night conditions can mask visual cues.

Thunderstorms at night may be obscured by darkness; use weather radar and lightning detection.

Wind forecasts are crucial for runway selection and crosswind limits; verify actual wind at the aerodrome.

Alternate requirements are more stringent at night; ensure adequate fuel and alternate weather.

Use ATIS or AWOS to get current aerodrome weather before approach.

Night takeoff and landing require additional caution due to limited visual references; use runway lights and VASI/PAPI.

Before taxi, ensure taxiway lights are visible and use low-speed taxi; follow taxiway centreline markings.

Use landing lights for takeoff and landing; turn them off when taxiing to avoid blinding other pilots.

Maintain a sterile cockpit during critical phases; avoid unnecessary conversation.

Plan for a stabilized approach; use instrument references and visual glidepath indicators.

Be prepared for a go-around if the approach is not stabilized or visual references are lost.

Use aircraft lighting to be seen by other traffic; turn on anti-collision lights before taxi.

Night currency and proficiency are essential; practice night takeoffs and landings with an instructor if needed.

Check NOTAMs for night-specific closures or lighting outages.

Runway edge lights are white; threshold lights are green (approach side) and red (departure side); runway end lights are red.

Taxiway edge lights are blue; taxiway centreline lights are green.

VASI (Visual Approach Slope Indicator) provides vertical guidance; PAPI (Precision Approach Path Indicator) uses red/white indications: more white than red means above glidepath, more red than white means below.

Approach lighting systems (ALS) include sequenced flashing lights (the rabbit) to help identify the runway environment.

Pilot-controlled lighting (PCL) may require keying the microphone on a specific frequency to activate; check the chart supplement for details.

ATC may provide traffic advisories and vectoring; maintain listening watch and read back clearances.

At uncontrolled aerodromes, use the common traffic advisory frequency (CTAF) and announce intentions.

Runway incursions are a risk at night; ensure clearances are understood and read back.

If radio communication fails, follow published lost communication procedures and light signals from ATC.

Decision-making at night is affected by fatigue, limited visual cues, and higher workload; use a structured decision model (e.g., DECIDE, 3P).

Recognize hazardous attitudes (anti-authority, impulsivity, invulnerability, macho, resignation) and apply antidotes.

Use risk assessment tools (e.g., IMSAFE, PAVE) before night flight.

Maintain situational awareness by monitoring instruments, outside references, and ATC communications.

Avoid plan continuation bias; be prepared to divert or cancel if conditions deteriorate.

Crew resource management (CRM) includes effective communication, workload sharing, and assertiveness.

Stress and fatigue degrade judgement; take breaks and use automation wisely.

After a night flight, review decisions to improve future performance.

Engine failure at night: establish best glide speed, select a landing area (preferably an airport or lit area), and attempt restart; declare an emergency.

Electrical failure: use backup instruments and flashlights; consider diverting to an airport with lighting.

Lost procedures: climb to a safe altitude, use navigation aids, and call ATC for assistance (e.g., DF steers).

If you experience disorientation, rely on instruments and avoid sudden manoeuvres; use the attitude indicator and heading indicator.

Forced landing at night: turn on landing lights, select a field, and use a stabilized approach; consider parachute if available.

Fire: follow checklist, shut off fuel and electrical, and land as soon as possible.

Medical emergency: declare an emergency, request priority, and consider diversion to a suitable airport.

Communication failure: follow published procedures, squawk 7600, and watch for light signals.

Always brief emergency procedures before night flight, including emergency egress and equipment location.