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36 Cards in this Set
- Front
- Back
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NVG VFR Training/Operational Weather |
700/2 |
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Night Unaided VFR Training/Operational Weather |
1000/2 |
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NVG Altitude Restrictions |
- NLT 50AHO when >=20%EMI exists. - Limited to NLT 150AHO when <20%EMI |
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An operable GPS receiver should be available for NVG flights below... |
300 AGL |
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Radar Altimeter Reqs |
- 2x for all low level flight. - 1x for all night ops (aided/unaided) below 500AHO. - 2x for all enroute NVG Ops below 300AGL (does not include term Ops at prepared landing sites.) |
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NVG/Unaided Training Search Criteria |
- NVG: Min Altitude of 300AGL - Unaided: Min Altitude of 500AGL |
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Mini-TOLD NVG |
- Mini-TOLD required for NVG/Low Level. - Card should be filled out for worst case data, be thoroughly briefed, and readily available |
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EMI Training Limitations |
Will not be conducted with less that 5%EMI |
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Unaided Altitude Enroute Restrictions |
500AHO w/i 5NM of flight path (unless directed lower by FAA Helo Route Charts) |
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Night Approaches to NonSurveyed/Unprepared Areas & Operational Sites |
- Don't leave altitude until HLZ is positively identified - Pattern Altitude = NLT 300ALS - Final approach commence NLT 300ALS |
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NVG Exterior Lighting Requirements |
- Operable White light (landing t searchlight) - Position lights: Steady Bright ---can be set to dim if it creates a hazard - Anti-Collision: Upper/Red ---Can be extinguished for safety - Operable searchlight required for all NVG Training flights <20%EMI, highly recommended for all NVG Flights |
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Goggle Failure.. |
- Other crewmembers may operate with NVGs provided unaided criteria is met (1000/2, 500AHO w/i 5NM) - During Training = Sortie terminated - During Ops = AC must weigh the risk of continuing |
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Unaided Night Approaches to NonSurveyed/Unprepared Areas & Operational Sites |
- Don't leave flight altitude until HLZ is positively identified. - No LOW RECON - Don't descend below 300ALS until established on the approach. |
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Flight time between 10000MSL and 12500MSL is unrestricted but shall not exceed _____ (time) if any portion is conducted at Night (with/without NVDs) |
1 hour |
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Class G Night Weather Cloud/Vis Mins |
Below 1200AGL: 1SM/Clear of clouds to see/avoid. Above 1200AGL/below 10000MSL: 3SM/500B-1000A-2000H Above 1200AGL/10000MSL: 5SM/1000B&A-1SM horizontal |
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When does Night start? |
Time between EECT and BMCT |
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Night eye sensitivity 10000x during first _____ (time) with little increase after that |
30 minutes |
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Dark adaptation is reached in approximately _____ (time) |
30-45 minutes |
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Time to recover dark adaptation after exposure to a bright light source |
5-45 minutes depending on time of exposure to the light source |
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Once in an intermediate state of dark adaptation, it takes ____ (time) for the to regain full dark adaptation after discontinuing NVG use. |
5-8 minutes |
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Illuminance (illumination) |
The amount of light that strikes an object/surface at some distance from the source. Ex the light that strikes the ground from the moon. |
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Luminance |
The amount of light emitted or reflected from a surface. The apparent brightness of a surface that is illuminated by moonlight. |
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Albedo |
Ratio between Illuminance and Luminance |
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Contrast |
The measure of luminance difference between two or more surfaces. Dependent on differing albedo levels. |
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Sources of Illumination |
- Moon is primary source at night, and dependent on moon angle/phase (less at low angles due to particulates know the sky/atmosphere) - Stars provide about 20% of night sky illuminance on a moonless night. - Sky glow - Ionization (chem reactions in the atmosphere) provides approx 40% of energy in the night sky. - Artificial light sources from towns/cities - |
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Skyglow |
Occurs up to 1.5hrs after sunset, and 30mins prior to sunrise |
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Order of the NVD |
Front to Back; Obj Lens-Minus Blue Filter-Photocathode-Microchannel Plate-Phosphor Screen-Fiber Optic inverter-Diopter Lens |
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Field of View vs. Field of Regard |
What you can see immediately through the NVD vs. what you see with your NVG scan. |
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Shading |
Condition- a dark area appears around the edge of the image Remedy- change tilt/distance from eye, shift helmets position. Failure- turn to MX |
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Edge Glow |
Condition- appears as a bright area along edge of outer rim. Caused by incompatible light source outside goggle FOV or shift in MCP. Remedy- Cup hand around outside edge Failure- turn to MX |
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Honeycomb |
Condition- from high illuminance condition due to manufacturing in the fiber optic inverter. Remedy- If it occurs during low illuminance or as a bold outline... Failure- turn to MX |
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Bright Spots |
Condition- results from irregular emission points on the photocathode during manufacturing. Remedy- Cant... if excessive amounts exists... Failure- turn to MX |
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Dark Spots |
Condition- Bright spots that have been corrected during manufacturing. Remedy- Cant...if a lot exist/distracting Failure- turn to MX |
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Distortion |
Condition- Bending: image has wavy appearance, horizontal/vertical; Shear: image has choppy appearance. Remedy- Cant... Failure- turn into MX |
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Scintillation |
Condition- Sparkling effect during low illumination conditions due to goggle gain. Can indicate deteriorating weather/IMC. Remedy- Cant... Failure- turn into MX |
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IMC Indications |
- Halos developing around incompatible light sources outside the aircraft - Loss of scene detail, visual acuity, terrain contrast - Partial/complete loss of moon/stars - Increasing scintillation - Anti-Collision & Nav lights flashing by aircraft - Looking underneath goggles |
