WEIGHT AND BALANCE
Robinson R44 Raven II · Weight And Balance
Overview
This document provides essential information regarding the weight and balance of the Robinson R44 II helicopter. It outlines the importance of adhering to specified weight and balance limits to ensure safe operation. The document includes detailed loading instructions, a weight and balance record form, and guidelines for adjusting the center of gravity using ballast. It emphasizes the need for recalculating weight and balance after any modifications and provides sample calculations to assist pilots in determining safe loading conditions. The loading instructions have been approved by the FAA, ensuring compliance with safety regulations.
- The helicopter must be operated within specified weight and balance limits to ensure safe control.
- Ballast can be added to adjust the center of gravity, but recalculations are necessary after any modifications.
- A continuous weight and balance record must be maintained, documenting any changes in equipment or weight.
- The loading instructions have been FAA-approved, ensuring compliance with safety regulations.
- Both empty and takeoff fuel conditions must be checked against CG limits for safe loading.
Document
Source
Originally published by robinsonstrapistorprod.blob.core.windows.net. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Weight And Balance
- Year
- 2014
- Pages
- 10
- File size
- 302 KB
- Publisher
- robinsonstrapistorprod.blob.core.windows.net
Specifications & performance
Extracted from this document.
Specifications
- Empty weight (lb)
- 1,510
- Max takeoff weight (lb)
- 2,496.5
Weight & balance
- Useful load (lb)
- 986.5
- Basic empty weight (lb)
- 1,510
- Max takeoff weight (lb)
- 2,496.5
Common. One of the most common aircraft types we track.
Most owners only have the POH. Here's the essential set for the Robinson R44 Raven II.
- Pilot's Operating Handbook / AFM
- Checklist
- Maintenance Manual
- Parts Catalog (IPC)
- Systems & Wiring
- Service Bulletins
- Type Certificate (TCDS)
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In this document
General
This section emphasizes the necessity of operating the helicopter within specified weight and balance limits to maintain control. It mentions that the center of gravity can be adjusted by adding ballast to under-seat compartments and that recalculations are required after any changes. It also notes that while the weight and balance data are not FAA-approved, the loading instructions are compliant with FAA regulations.
Weight and Balance Record
This section provides a form for maintaining a continuous record of the helicopter's weight and balance. It instructs users to log any changes in equipment or modifications that affect weight and balance, ensuring that the new empty center of gravity is determined. The original factory weight and balance data is included as the first entry.
Loading Instructions
This section outlines how to calculate the loaded helicopter's weight and center of gravity. It includes a table with common item weights and their respective longitudinal and lateral arms. A sample calculation is provided to demonstrate how to determine the weight and CG position, emphasizing that both empty and takeoff fuel conditions must be within limits.
Sample Loading Calculation
A detailed example is provided to illustrate the process of calculating the loaded helicopter's weight and center of gravity. It includes specific weights, locations, and moments for various items, culminating in a total takeoff gross weight and CG location. This section serves as a practical guide for pilots to ensure safe loading.
Safety notes
- Fuel burn causes the center of gravity to move forward during flight; always check loading with both empty and takeoff fuel.
Full document text
SECTION 6 WEIGHT AND BALANCE CONTENTS Page General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 Weight and Balance Record . . . . . . . . . . . . . . . . . . . . . . 6-2 Loading Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4 ROBINSON MODEL R44 II SECTION 6 WEIGHT AND BALANCE REVISED: 21 FEB 2014 6-i INTENTIONALLY BLANK ROBINSON MODEL R44 II SECTION 6 WEIGHT AND BALANCE REVISED: 21 FEB 2014 6-1 SECTION 6 WEIGHT AND BALANCE GENERAL The helicopter must be flown only within weight and balance limits specified in Section 2. Loadings outside these limits can result in insufficient control travel for safe operation. The center of gravity may be adjusted by adding removable ballast (any appropriate item of mass) to any under-seat baggage compartment. Recalculate weight and balance after adding ballast, and verify ballast meets baggage compartment limits given in Section 2. Loaded helicopter weight and balance can be determined using the method given under LOADING INSTRUCTIONS. In accordance with FAA procedures, the detail weight and balance data of this section are not subject to FAA approval. The loading instructions of this section, however, have been approved by the FAA as satisfying all requirements for instructions on loading of the rotorcraft within approved limits of weight and center of gravity and on maintaining the loading within such limits. CAUTION Fuel burn causes CG to move forward during flight. Always determine safe loading with empty fuel as well as with takeoff fuel. Payload may be limited by forward CG as fuel is burned. ROBINSON MODEL R44 II SECTION 6 WEIGHT AND BALANCE REVISED: 21 FEB 2014 6-2 WEIGHT AND BALANCE RECORD The following form should be used to maintain a continuous record of your helicopter’s weight and balance. Each time an item of equipment is removed or installed, an entry must be made and the new empty CG determined. The original factory weight and balance and an equipment list is supplied with each helicopter on a form which is inserted at the end of this section. This weight and balance provides the first entry in the Weight and Balance Record form. NOTE Calculated CG with full fuel and 150 lb pilot must be within CG limits. Following modification, ad- justment to fixed nose ballast may be required. See R44 Maintenance Manual. ROBINSON MODEL R44 II SECTION 6 WEIGHT AND BALANCE REVISED: 21 FEB 2014 6-3 WEIGHT AND BALANCE RECORD (Continuous History of Changes in Structure or Equipment Affecting Weight and Balance) HELICOPTER MODEL R44 II SERIAL NUMBER: DATE DESCRIPTION OF ARTICLE OR MODIFICATION WEIGHT CHANGE RUNNING BASIC EMPTY WEIGHT ADDED (+) REMOVED (—) WEIGHT (lb) LONGITUDINAL LATERAL (+ = RIGHT SIDE) WEIGHT (lb) LONGITUDINAL LATERAL Arm (in.) Moment (in.-lb) Arm (in.) Moment (in.-lb) Arm (in.) Moment (in.-lb) Arm (in.) Moment (in.-lb) HELICOPTER AS WEIGHED WEIGHT AND BALANCE RECORD (cont’d) ROBINSON MODEL R44 II SECTION 6 WEIGHT AND BALANCE REVISED: 26 JAN 2024 6-4 LOADING INSTRUCTIONS The following table may be used when calculating loaded helicopter weight and CG position. COMMON ITEM WEIGHT & CG Item Weight (lb) Longitudinal arm (in.) Lateral arm (in.) (+ = right side) Pilot (right forward seat) 49.5* +12.2 Left forward passenger 49.5* —10.4 Baggage under forward seats 44.0 ±11.5 Aft passengers and baggage under aft seats 79.5 ±12.2 Main fuel** 106.0 —13.5 Aux fuel** 102.0 +13.0 Forward doors 7.5 each 49.4 ±24.0 Aft doors 7.0 each 75.4 ±23.0 Removable controls (cyclic, collective, pedals) 2.0 31.0 —13.0 Items on accessory mount bars 25.0 ±14.0 * If additional backrest cushion is used, subtract thickness of compressed cushion. ** A longitudinal arm of 104.5 in. may be used for combined main and aux fuel. ROBINSON MODEL R44 II SECTION 6 WEIGHT AND BALANCE REVISED: 26 JAN 2024 6-5 LOADING INSTRUCTIONS (cont’d) The following sample calculation demonstrates how to determine loaded helicopter weight and center of gravity. A worksheet is provided on the page following the sample calculation for a weight and balance calculation for your helicopter. Calculated weight and balance must be compared with the CG limits given in Section 2 to determine safe loading. Both takeoff and empty fuel conditions must be within limits. Lateral CG usually falls well within limits for conventional loadings. If an unusual lateral installation or loading occurs, lateral CG should be checked against the CG limits given in Section 2. The lateral reference datum is the aircraft centerline with items to the right positive and items to the left negative. ROBINSON MODEL R44 II SECTION 6 WEIGHT AND BALANCE REVISED: 26 JAN 2024 6-6 LOADING INSTRUCTIONS (cont’d) SAMPLE LOADING CALCULATION Item Weight (lb) Location Moment Long. Arm (in.) Lat. Arm (in.) += Right Side Long. (in.-lb) Lat. (in.-lb) Basic empty weight 1510 106.5 0.2 160,815 302 Remove forward right door —7.5 49.4 24.0 —371 —180 Remove forward left door 49.4 —24.0 Remove aft right door 75.4 23.0 Remove aft left door 75.4 —23.0 Remove left seat controls 31.0 —13.0 Pilot (forward right seat) 170 49.5 12.2 8415 2074 Left forward passenger 170 49.5 —10.4 8415 —1768 Aft right passenger 170 79.5 12.2 13,515 2074 Aft left passenger 170 79.5 —12.2 13,515 —2074 Baggage under forward right seat 10 44.0 11.5 440 115 Baggage under forward left seat 10 44.0 —11.5 440 —115 Baggage under aft right seat 79.5 12.2 Baggage under aft left seat 10 79.5 —12.2 795 —122 Items on accessory mount bars 5 25.0 14.0 125 70 Zero usable fuel weight and CG* 2217.5 92.9 0.2 206,104 376 Usable main fuel at 6 lb/gal. 177 106.0 —13.5 18,762 —2390 Usable aux fuel at 6 lb/gal. 102 102.0 13.0 10,404 1326 Takeoff Gross Weight and CG* 2496.5 94.2 —0.3 235,270 —688 * CG location (arm) for loaded helicopter is determined by dividing total moment by total weight. ROBINSON
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MODEL R44 II SECTION 6 WEIGHT AND BALANCE REVISED: 26 JAN 2024 6-7 LOADING INSTRUCTIONS (cont’d) LOADING CALCULATION WORKSHEET Item Weight (lb) Location Moment Long. Arm (in.) Lat. Arm (in.) += Right Side Long. (in.-lb) Lat. (in.-lb) Basic empty weight Remove forward right door 49.4 24.0 Remove forward left door 49.4 —24.0 Remove aft right door 75.4 23.0 Remove aft left door 75.4 —23.0 Remove left seat controls 31.0 —13.0 Pilot (forward right seat) 49.5 12.2 Left forward passenger 49.5 —10.4 Aft right passenger 79.5 12.2 Aft left passenger 79.5 —12.2 Baggage under forward right seat 44.0 11.5 Baggage under forward left seat 44.0 —11.5 Baggage under aft right seat 79.5 12.2 Baggage under aft left seat 79.5 —12.2 Items on accessory mount bars 25.0 Zero usable fuel weight and CG* Usable main fuel at 6 lb/gal. 106.0** —13.5 Usable aux fuel at 6 lb/gal. 102.0** 13.0 Takeoff Gross Weight and CG* * CG location (arm) for loaded helicopter is determined by dividing total moment by total weight. ** A longitudinal arm of 104.5 in. may be used for combined main and aux fuel. Do not use combined main and aux fuel if calculating lateral arm. THIS PAGE INTENTIONALLY BLANK ROBINSON MODEL R44 II SECTION 6 WEIGHT AND BALANCE ISSUED: 21 FEB 2014 6-8
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