TM 1-1520-240-BDCHAPTER 1GENERAL INFORMATION AND ASSESSMENTSECTION I. GENERAL1-1.INTRODUCTION. During the first few days ofcombat maximum aircraft availability is essential.Aircraft will sustain varying degrees of damage duringcombat operations. The damage must be assessed andrepaired as quickly as possible. Maximum availabilitymust be maintained for further sorties. In addition to thecombat damage, aircraft will have higher componentfailure rates because of increased flying hours andhigher stress levels. Aircraft combat maintenancebattle-damage repair (ACM/BDR) is an operationalconcept for maintaining aircraft at a high level ofreadiness in combat. Peacetime maintenanceprocedures and methods must be modified to achievethis. One method will be to defer all but the mostessential maintenance needed for the next scheduledmission. They will often be flown with nonessentialcomponents damaged, inoperative, or missing.a.Scheduled Maintenance. There are noscheduled maintenance and inspections. However,necessary lubrication, servicing; and operational checkswill not be deferred. When conditions permit, the“overflown" inspections will be completed. Whenexpedient repairs are made on the aircraft or repair ofdamage is deferred, to ensure flight safety or missionaccomplishment, it may be necessary to scheduleinspections at subsequent flight hour intervals.Scheduled battle damage inspections of this type willnot be deferred.b.UnscheduledMaintenance. Repair of systemsand subsystems which are not critical to missionaccomplishment, may be deferred unless they mightcause further damage. Items may be deferred even if itplaces operational limitations on the aircraft, as long asthe restricted aircraft can accomplish designatedmissions and can contribute to the battle. Deferment ofrepairs for a one-time flight to a higher maintenancelevel, or for self-recovery from a combat area, is highlydesirable. This eliminates the need for another aircraftto accomplish the recovery, or the loss of the aircraft ifrecovery is not available. The maintenance officer orassessor will make the decision based on an analysis ofthe overall situation and airworthiness of the aircraft.c.Assessment.Aircraft which have battle damagewill be inspected and classified by a damage assessorusing a method similar to the medical concept of"triage." Following assessment some aircraft will bereturned to service immediately through deferment.Other aircraft will be repaired using approved battledamage repair techniques. Those requiring extensiverepair (4 to 24 hours) will be set aside and repaired asmanpower and parts become available. Assessors willbe trained to identify and assess damage and failedaircraft subsystems. They will learn isolation and repairmethods and procedures and serviceability standards.1-2.PURPOSE. This manual provides informationand instructions for assessing and repairing battledamage to the Army CH-47D Chinook helicopter. Thepurpose of the manual is to assist the damage assessorin identifying and classifying aircraft battle damage,assessing the extent of damage, and determining ifrepair can be safely deferred. Methods of expedientbattle-damage repair are also presented.1-3.SCOPE. This manual is to be used to assess andrepair battle damage to the CH-47D helicopter. It isintended for use by aviation unit maintenance (AVUM)and aviation intermediate maintenance (AVIM)personnel during combat operations, and for training ofpersonnel. The procedures are to be used only duringcombat operations or during periods of extremeemergency. The commander determines when normalmaintenance procedures may be deferred. Repairs aremade using interim techniques, off-the-shelf standardhardware (not necessarily aircraft related), and withoutconcern for appearance. As new repair procedures,materials, tools, and equipment become available theywill be introduced and incorporated into this manual.1-4.FORMS.RECORDS.ANDRFPORTS.a.StatusSymbols. Status symbols used in aircraftlogbooks to record defects are defined below:(1)Red"X".A red "X" shows that a defectexists and the aircraft is unsafe for flight.(2)CircledRed"X".A red "X" inside a redcircle indicates a limiting defect. The aircraft may beflown under specific limits as directed by higherauthority, or as directed locally until corrective action istaken.1-1
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