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In EMU Status Report #17, astronaut Ken Mattingly (Mattingly was the astronaut responsible for following the development of the EMU) reports under the heading "Potential Problems" that "PGA pressure drops have been uncontrolled on crew training suits. Col. Borman's suit had sufficient pressure drop to reduce the PLSS flow to 5 cfm. ILC is to insure that pressure drop specs are met on all future suits."
In EMU Status Report #18, under the heading "Problems", Mattingly documents the following, "EMU Ventilation - The PLSS has been consistently providing 5.5 cfm or less with pressure drops of 1.5" H2O. The PGA's on the other hand, have been consistently running above 2.0" H2O pressure drop. I am not aware of any effort on this problem; however, I suspect one proposed solution will be to lower the minimum flows to 5.0 cfm. This may be reasonable; however, it must be demonstrated.
Internal ILC Project Directive 1011 titled "Temporary Configuration Change for Fit Check of PGA's A7L-039, 050, 053, 054, 056 (Armstrong's) and 060." Project Directive Contents: "The present configuration of the subject PGA's requires installation of Vent Port, P/N A6L-101036-11. This vent port will interface with the 360 degree helmet-side Neck Ring.
Manufacturing is requested to remove the -11 Vent Port and install A6L-101036-03 in all subject suits prior to fit check. This transfer is required because of unavailability of suitable Helmet Assemblies at the time of fit check.
In addition, Engineering is submitting an ECR to change the color of the -11 Vent Port from blue to red. Therefore, Manufacturing should not reinstall the blue -11's pending Engineering disposition of the existing stock.
Internal ILC Project Directive 1034. titled "Fit Check Corrective Action of PGA-A7L-056" (Armstrong's PGA). Project Directive contents: "Astronaut Armstrong was satisfactorily fit checked on December 5, 1968. It should be noted that Vent Ports will have to be replaced to accommodate the redesigned Helmet Assembly, which will be available from Air-Lock on 1/2/69. QA & R is requested to perform PDA on the Helmet Assembly subsequent to PDA on the PGA to allow shipment as noted on the attached schedule."
In EMU Status Report #19, Mattingly reports the following: " PGA vent flow pressure drops are now within specification. (New suits; not new specification)!
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