Operating Instructions - Section 30 2/13 OM3072
Page 30-4
Engine Side Panels
General
Both sides of the engine bay have been enclosed
with attenuator panels (8, Figure 30-4), and access
doors (7) for maintenance personnel.
Maintenance
Refer to the Sound Attenuation System Service sec-
tion for periodic inspection requirements.
Do not pressure wash the sound attenuation sur-
faces. Malfunction and damage may occur,
reducing the effectiveness of the attenuators.
Periodically, the attenuators need to be disassem-
bled for maintenance. Refer to Sound Attenuation
System Service for maintenance intervals. Follow the
steps below to service the attenuators.
1. Remove the attenuator housing (8, Figure 30-
4). Once on the ground, the splitter packs can
be removed as a unit.
2. Remove the perforated cover to gain access to
the insulation pillow and remove the pillow. The
pillow should have a protective cloth between
the insulation and the perforated cover. The
insulation should be clean, soft, and free from
debris. The insulation should be of consistent
density, and fill the cavity completely, not slump-
ing to the bottom.
NOTE: If a significant amount of damage or soiling of
any of the parts has been observed, replacement
insulation pillows must be installed to ensure correct
performance of the parts.
3. With the insulation pillows removed, use a pres-
sure washer only on the metal parts. Remove
all of the debris, oil, or grease present on the
parts.
4. Reassemble and reinstall the pack. Repeat for
the remaining packs.
Approximate weights
Always use a lifting device that can handle the
load safely. Lifting lugs are fitted to the top of the
attenuator housings (8).
Access Door Assembly - 54 kg (119 lb)
Side Exhaust Attenuator LH - 81 kg (179 lb)
Side Exhaust Attenuator RH - 70 kg (154 lb)
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