Table Column/Code Description RA Content Indicator APP Application REG Registration RA Application Purpose AM Amendment of a previously filed, currently pending application AU Administrative Update CA Cancellation of a registered, unconstructed structure DI Notification of antenna structure dismantlement D Request a duplicate Registration document MD Modification of a registered antenna structure NE Application to register an antenna structure that has not been registered NT Notification that an antenna structure has been constructed OC Ownership change WD Withdrawal of a pending application RA Input Source Code D diskette I interactive M manual RA Status Code A Canceled C Constructed D Dismissed G Granted I Dismantled O Owner removed P Pending R Returned T Terminated W Withdrawn RA Archive Flag Code C current version A Archive RA Specification Option 1, 2, 3 FAA Chapters 4 FCC Paragraphs RA Invalid Signature Code N Invalid Signature Y Valid Signature RS Content Indicator APP Application REG Registration RS Reason Type D Dismissal R Return EN Content Indicator APP Application REG Registration EN Entity Type O Owner R Representative A Assignor CO Content Indicator APP Application REG Registration CO Coordinate Type T Tower A Array RE Content Indicator APP Application REG Registration RE Remark Type FAA FAA remark FCC FCC (external) remark SC Content Indicator APP Application REG Registration HS Content Indicator APP Application REG Registration AT Content Indicator APP Application AT Attachment Code N NEPA O other W waiver DP Specification Option 1, 2, 3 FAA Chapters 4 FCC Paragraphs