Question and Answer 6.docx
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- Attached to
- Ground Power Modernization Federal contract opportunity
- Solicitation number
- FA8532-22-R-0001
About this file
This document provides details on an anticipated federal contract opportunity for ground power equipment. The Air Force Materiel Command Lifecycle Management Center at Robins Air Force Base plans to issue a request for proposal for indefinite-delivery, indefinite-quantity multiple award contracts. The contracts will include requirements for 72kW ground power units, 144kW ground power units, and 144kW universal load banks to provide power to various Air Force aircraft. The total estimated quantities are 2928 units for the 72kW GPUs, 250 units for the 144kW GPUs, and 300 units for the 144kW ULBs. One group of contracts will consolidate all three end items on a full and open basis, while a separate small business set-aside contract will be for the 72kW GPUs only. The contracts will have a basic three-year period and seven one-year ordering periods, with an anticipated release of the RFP on October 15, 2021 and award date of September 26, 2022.
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Solicitation Questions and Answers #6 9 Nov 2021
| Q1: | Section 3.9.3 specifies that SAE AS8090 shall be the governing document for the design of the | chassis, unless otherwise specified. Per AS8090 requirements for Type 2 Class C, table 3 | indicates that this type of system is to have service brakes of either Air, Air over hydraulic, or | inertia activated mechanical or hydraulic brakes on all four wheels. This is further reinforced by | the ASM A8090 referencing Federal Motor Vehicle Safety Standards (FMVSS 393.40, 41, 42, 52) | which further indicate the need for 4 wheel service brakes. However, in section 3.9.3.6 of the | 72Kw Purchase Description it specifically states “Surge type, hydraulic type, or automatically | applied parking brakes are prohibited.” Section 3.9.3.6 also limits the parking brakes to “both | the right and left wheel positions of the rear axle in accordance with 3.6.1 of SAE AS8090. | The purchase description does not make any mention of 4 wheel service brakes. The question is, | is a 4 wheel service brake system required on this system, or is the two wheel leaver operated | parking brake sufficient to conform with the specification of the 72kW GPU? |
| A1: | PD21WRWNZEA008 paragraph 3.9.3 states “All other requirements and specifications contained | with SAE AS8090 as applicable to Type II, Group C towed aerospace ground equipment shall be | in full force and effect unless stated otherwise herein.” Therefore, PD21WRWNZEA008 | paragraph 3.9.3 requires the 72 kW/90 kVA GPU to meet the requirements of SAE AS8090 for | Type II, Group C equipment unless PD21WRWNZEA008 explicitly states otherwise. Note that | Table III and Table IV of SAE AS8090 list requirements for multiple types of towed aerospace | ground equipment. Within SAE AS8090, the requirements for mandatory four wheel braking, of | either parking or service type do not align with the rows and columns detailing Type II, Group C | performance; therefore, SAE AS8090 does not define a mandatory four wheel braking | requirement for Type II, Group C equipment and neither does PD21WRWNZEA008. | ||
| PD21WRWNZEA008 paragraph 3.9.6.3 is the governing requirement for brakes on the 72 kW/90 | kVA GPU. There is no mandatory requirement for four wheel parking brakes; the minimum | requirement for parking brakes is found in PD21WRWNZEA008 paragraph 3.9.6.3. The maximum | tow speed and GVW of the 72 kW/90 kVA GPU should not justify the use of four wheel parking | brakes to remain stationary under the conditions required within PD21WRWNZEA008; however, | in accordance with SAE AS8090, the contractor shall perform their own braking analysis based | upon the selected components for final determination of parking brakes on the front axle. It is | noted the Government prefers properly sized parking brakes be fitted to the rear axle only as | specified in PD21WRWNZEA008 paragraph 3.9.6.3. | ||||
| There is no explicit requirement for service brakes of any type contained within | PD21WRWNZEA008. PD21WRWNZEA008 paragraph 3.9.6.3 is the governing requirement for | brakes on the 72 kW/90 kVA GPU and this paragraph only requires parking brakes. As such, | there is no PD21WRWNZEA008 mandatory requirement for service brakes; service brakes are | not required nor are they desired. The maximum tow speed and GVW of the 72 kW/90 kVA GPU | do not justify the use of service brakes to maintain braking stability under the operational | conditions required within PD21WRWNZEA008. | ||||||
| The Government will take action to modify PD21WRWNZEA008 to clearly delineate that service | brakes are not to be installed on the 72 kW/90 kVA GPU. |
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