ECR Title: Pcal Periscope Mirror Alignment Pin	DCC No: E1300038-v1
Date: 11 JAN 2013
Requester: Craig Conley	Impacted Subsystem(s): AOS
Description of Proposed Change(s): Creation of P/N D1300022.
Reason for Change(s): The D1200172 & D1200173 Mirror Mount Bases (used on the Pcal Periscope Structure) were intended to be fitted (press fit) with 3/16” diameter commercial dowel pins to slip-fit the respective Siskiyou mirror mounts for which the Bases are designed. This gives repeatable precision alignment to the mirror mounts in removal and replacement from and to the Periscope Structure. The bases were mistakenly designed and manufactured with press fit holes for ¼” diameter dowel pins. D1300022 is a two diameter pin to be used in the Bases to correct this discrepancy.
Estimated Cost: $3,500
Schedule Impact Estimate: 5 man hours
Nature of Change (check all that apply): Safety Correct Hardware Correct Documentation	Improve Hardware Improve/Clarify Documentation Change Interface Change Requirement
Importance: Desirable for ease of use, maintenance, safety Desirable for improved performance, reliability Essential for performance, reliability Essential for function Essential for safety	Urgency: No urgency Desirable by date/event: ____________ Essential by date/event: ____________ Immediately (ASAP)
Impacted Hardware (select all that apply): Repair/Modify. List part & SNs: ______________________ Scrap & Replace. List part & SNs:_____________________ Installed units? List IFO, part & SNs: _________________ Future units to be built	Impacted Documentation (list all dwgs, design reports, test reports, specifications, etc.): D1200172, D1200173
Disposition (to be completed by Systems Engineering): TRB CCB Approved Additional information required. Define: [Requester re-submits with new information with the same DCC E-number for the ECR but the next version number.] Concurrence by Project Management: (Acknowledged Electronically in DCC) Project Systems Engineer: Dennis Coyne Project Systems Scientist: Peter Fritschel