SATPC0037542 Tab 04 4 SOW..pdf

1/15/2025

Statement of Work

Shock and Vibration Testing of Reefing Line Cutters

1. SCOPE

Test Description

The Contractor shall perform the following:

Shock Testing -

1. Perform checkout tests using mass simulators to develop the required shock pulse.

2. Perform three (3) shock tests in each orthogonal axis in both directions (positive and negative) on the following test articles:

a. Eight (8) 8-Second Roberts Research Lab RLCs (P/N SLH26101149-303)

b. Seven (7) 16-Second Roberts Research Lab RLCs (P/N SLH26101149-304)

c. One (1) Tech Ord 8-Second RLCs (P/N: 215836)

d. Two (2) Tech Ord 16-Second RLCs (P/N: 215837)

3. Prove a test report.

Vibration Testing -

1. Perform checkout tests to develop the required vibration plots.

2. Perform one (1) vibration test in each orthogonal axis on the following test articles:

a. Eight (8) 8-Second Roberts Research Lab RLCs (P/N SLH26101149-303)

b. Seven (7) 16-Second Roberts Research Lab RLCs (P/N SLH26101149-304)

c. One (1) Tech Ord 8-Second RLCs (P/N: 215836)

d. Two (2) Tech Ord 16-Second RLCs (P/N: 215837)

3. Provide a test report.

Test Article Description

A representative Reefing Line Cutter (RLC) and its axis definition are shown in Figure 1 and

Figure 2. The X and Y axes are defined as the lateral axes, and the Z axis is defined as the longitudinal axis. The 8-Second Roberts Research Lab RLC (P/N -303) measures approximately 4.75 inches in length and the 16-Second Roberts Research Lab RLC (P/N -304) measures approximately 5.15 inches in length. The 8-Second Tech Ord RLC (P/N: 215836) measures approximately 4.1 inches in length and the 16-Second Tech Ord RLC (P/N: 215837) measures approximately 4.5 inches in length. All RLCs’ delay cartridges contain an output mix of approximately 120 ± 3 mg of lead azide, have a cutting capacity of 6500 lbf, and a diameter of 0.44”. The safety pin shall be removed prior to shock testing and reinstalled after completion of shock testing. The RLCs shall be installed in the provided fixture sent with the cutters.

Figure 1: Representative SLH26101149-303 RLC

Figure 2: Representative Tech Ord RLC (215836-1 & 215837-1)

2. SHOCK TEST TECHNICAL REQUIREMENTS

Shock Requirements

Each test article shall be subjected to three (3) shock tests in each orthogonal axis and meet the half-sine shock pulse requirements shown in Figure 2. Each test article shall be tested with the safety pin removed.

Figure 2: Half-Sine Shock Pulse Configuration & Tolerance Limits

Test Instrumentation

All instrumentation equipment shall be in current calibration for the test. Accelerometer part numbers and calibration data shall be recorded. All response data shall be permanently recorded for all shock tests. Instrumentation for shock testing shall include two (2) tri-axial arrangements of accelerometers on opposite sides of the test article fixture. The provided fixture will include mounting locations for accelerometers. The test fixture provided accommodates up to six (6) cutters of either configuration, for the unused spot a mass simulator will take its place.

Figure 4: Reefing Line Cutter Assembly, Nominal Ascent, Abort and Deployment

Random Vibration (Margin Included)

Test Instrumentation

All instrumentation equipment shall be in current calibration for the test. Accelerometer part numbers and calibration data shall be recorded. All response data shall be permanently recorded for all vibration tests. Instrumentation for vibration testing shall include two (2) control single axis accelerometers on opposite sides of the test article fixture. The provided fixture will include mounting locations for accelerometers. The test fixture provided accommodates up to four (4) RLCs any unused spots will remain empty.

Figure 3: Representation of Roberts RLCs in Vibration Fixture and Axis Orientation

Data Acquisition

All accelerometer data, including time history and PSD plots, as well as a digitized copy of the

PSD data shall be provided. Checkout test data shall be provided for review prior to proceeding to test article vibration tests. In the event of an out-of-tolerance condition during test article vibration tests, NASA shall be notified and consulted before proceeding to subsequent vibration tests.

4. ADMINISTRSTIVE REQUIREMENTS

Pre- and Post-Test Visual Inspections

A visual inspection of each test article shall be performed before and after shock testing.

Photographs shall be taken and included in the test report.

NASA Test Witnessing

NASA personnel shall be allowed to be physically present to witness the test including set-up operations and test article installation into the shock test fixture.

Delivery Schedule and Turn-Around Time

Test article delivery to the Contractor is to be determined (TBD). The Contractor is requested to return the test articles and supply a test report to NASA within 2 weeks from the date of test completion.

Test Report

The Contractor shall furnish a test report that will include test set-up photographs, calibration information, and test results as well as any other information necessary to describe the test operations performed and the results obtained. If hardware is damaged during test, photographs will be provided in addition to a written description.

5. SAFETY REQUIREMENTS

The Contractor shall comply with all Federal, State, and Local codes and standards applicable to work performed on this contract.

Each RLC contains a delay cartridge with the following explosive constituents:

• 120 ± 3 mg of lead azide

• 1.0-1.5 g of delay charge

The RLC is initiated via pulling of the lanyard, which requires approximately 30 lbf. Do not pull on the lanyard, and exercise caution when handling the RLC with the safety pin removed.

Appropriate controls/safeguards shall be implemented to mitigate hazards associated with unintentional initiation of the RLC. Such hazards include high sound levels, high temperatures, shrapnel or blast wave over-pressurization, and sharp points or edges. In the event of unintentional initiation, the RLC is self-contained but may heat to temperatures in excess of

250°F. Do not place fingers in the RLC aperture where the blade is located. Recommended hazard controls and example procedural steps can be provided upon request.

6. SHIPPING, PRESERVATION AND PACKAGING REQUIREMENTS

The Contractor shall repackage the test articles in the same packaging that they were shipped

in. The test articles shall be shipped with the safety pins installed. A NASA/JSC FedEx account number will be supplied for return shipping. The Contractor shall ship all deliverables to the following address unless otherwise directed by NASA:

NASA/Lyndon B. Johnson Space Center

Houston, TX 77058