Robinson Helicopter Company RTR 660, Maintenance Manual

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8-32 Empennage Ballast
Refer to R66 Illustrated Parts Catalog (IPC) Figure 8-1.
NOTE
Use only approved materials listed in Section 20-70.
CAUTION
Altering fixed ballast can appreciably affect helicopter center of
gravity (CG). If fixed ballast information is unknown, reweigh
helicopter per Section 8-22.
WARNING
Maximum allowable empennage ballast is 3.00 lb. If empennage
ballast is required per Section 8-22, two D301-2 weights must
be installed as shown in Figure 8-5.
A. Removal
1. Refer to Figure 8-5. Remove empennage assembly, including D301-2 ballast weights,
per Section 53-50.
2. Solvent-clean bare metal around and between bolt holes on horizontal stabilizer upper
and lower surfaces.
3. Apply light coat zinc-chromate or epoxy primer to bare metal surfaces. While primer
is wet, install empennage assembly per Section 53-50. Topcoat hardware with
colored paint as desired.
4. Reweigh and/or calculate basic empty weight and CG per Section 8-22.
5. Revise Weight and Balance Record in R66 Pilot's Operating Handbook (POH) Section
6 to reflect ballast removal using the following data:
Weight Longitudinal
Arm
Longitudinal
Moment
Lateral
Arm
Lateral
Moment
Empennage ballast 3.00 lb 325.44 in. 976.32 in.-lb 4.45 in. 13.35 in.-lb
B. Installation
1. Refer to Figure 8-5. Remove empennage assembly per Section 53-50.
2. Solvent-clean bare metal around and between bolt holes on horizontal stabilizer upper
and lower surfaces.
3. Temporarily install D301-2 weights per R66 IPC Figure 8-1. Torque bolts per Section
20-32.
4. Trace outline of weights onto horizontal stabilizer upper and lower surfaces using
felt-tip, non-permanent marker or tape. Remove weights.
SEP 2012 R66 Maintenance Manual Chapter 8 Weight and Balance
Page 8.13