Gentex HGU-55/P, Инструкция по эксплуатации и техническому обслуживанию с иллюстрированным перечнем деталей

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Chapter 4: Replacement Parts and Optional Items
Leather earpads (
Figure 4-10
)
• Gray: 79C4473-3
• Black: 89C7735-1
The gray leather comfort earpads are
designed to hold the earphones directly
inside.
The black leather earpad sets contain plastic
earcups (with earphone holders inside) and
are designed for high-noise environments.
High-impedance earphones ( Figure 4-11 )
• 300-ohm: 75B3195
• 600-ohm: 90A7929
• 1000-ohm: 71B2383
Various impedances meet individual needs.
Special-use visors ( Figure 4-12 )
• High-contrast, MBU-12/P: 81D5189-12
• High-contrast, MBU-20/P: 91A8058-1
• Gradient, MBU-12/P:
81D5189-11
• Gradient, MBU-20/P: 91A8058-2
The high-contrast visor (yellow) enhances
vision in snowy, foggy, hazy or cloudy
environments; it causes the blue portions of
the visible spectrum to appear black or dark
while other colors appear nearly normal.
Many pilots prefer the high-contrast visor for
use over desert environments.
The gradient visor (neutral gray at the top,
transitioning to clear at the bottom) provides
sunshade protection while allowing the user
to see instrumentation clearly.
(Continued on next page)
Figure 4-10. Leather Earpads
Figure 4-11. Earphones
Figure 4-12. Special-Use Visors
Gray leather comfort earpads
Black leather earpad set
High-contrast
Gradient