5-2-6. FUNCTION CODE ASSIGNMENTS

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  • 5-2-6. FUNCTION CODE ASSIGNMENTS

    Unless otherwise specified by a directive or a letter of agreement, make nondiscrete code assignments from the following categories:

    1. Assign codes to departing IFR aircraft as follows:
      1. Code 2000 to an aircraft which will climb to FL 240 or above or to an aircraft which will climb to FL 180 or above where the base of Class A airspace and the base of the operating sector are at FL 180, and for interfacility handoff the receiving sector is also stratified at FL 180. The en route code must not be assigned until the aircraft is established in the high altitude sector.
      2. Code 1100 to an aircraft which will remain below FL 240 or below FL 180 as above.
      3. For handoffs from terminal facilities when so specified in a letter of agreement as follows:
        1. (a) Within NBCAP airspace- Code 0100 to Code 0400 inclusive or any other code authorized by the appropriate service area office.
        2. (b) Outside NBCAP airspace- Code 1000 or one of the codes from 0100 to 0700 inclusive or any other code authorized by the appropriate service area office.
    2. Assign codes to en route IFR aircraft as follows:
      • NOTE:
      • 1. FL 180 may be used in lieu of FL 240 where the base of Class A airspace and the base of the operating sector are at FL 180, and for interfacility handoff the receiving sector is also stratified at FL 180.
      • 2. The provisions of subparas b2(b) and (c) may be modified by facility directive or letter of agreement when operational complexities or simplified sectorization indicate. Letters of agreement are mandatory when the operating sectors of two facilities are not stratified at identical levels. The general concept of utilizing Codes 2100 through 2500 within Class A airspace should be adhered to.
      1. Aircraft operating below FL 240 or when control is transferred to a controller whose area includes the stratum involved.
        1. (a) Code 1000 may be assigned to aircraft changing altitudes.
        2. (b) Code 1100 to an aircraft operating at an assigned altitude below FL 240. Should an additional code be operationally desirable, Code 1300 must be assigned.
      2. Aircraft operating at or above FL240 or when control is transferred to a controller whose area includes the stratum involved.
        1. (a) Code 2300 may be assigned to aircraft changing altitudes.
        2. (b) Code 2100 to an aircraft operating at an assigned altitude from FL 240 to FL 330 inclusive. Should an additional code be operationally desirable, Code 2200 must be assigned.
        3. (c) Code 2400 to an aircraft operating at an assigned altitude from FL 350 to FL 600 inclusive. Should an additional code be operationally desirable, Code 2500 must be assigned.
      3. Code 4000 when aircraft are operating on a flight plan specifying frequent or rapid changes in assigned altitude in more than one stratum or other conditions of flight not compatible with a stratified code assignment.
        • NOTE:
        • 1. Categories of flight that can be assigned Code 4000 include certain flight test aircraft, MTR missions, aerial refueling operation requiring descent involving more than one stratum, ALTRVs where continuous monitoring of ATC communications facilities is not required and frequent altitude changes are approved, and other aircraft operating on flight plans requiring special handling by ATC.
        • 2. Military aircraft operating VFR or IFR in restricted/ warning areas or VFR on VR routes will adjust their transponders to reply on Code 4000 unless another code has been assigned by ATC or coordinated, if possible, with ATC.
    3. Assign the following codes to arriving IFR aircraft, except military turbojet aircraft as specified in para 4-7-4, Radio Frequency and Radar Beacon Changes for Military Aircraft:

      NOTE: FL 180 may be used in lieu of FL 240 where the base of Class A airspace and the base of the operating sector are at FL 180, and for interfacility handoff the receiving sector is also stratified at FL 180.

      1. Code 2300 may be assigned for descents while above FL 240.
      2. Code 1500 may be assigned for descents into and while within the strata below FL 240, or with prior coordination the specific code utilized by the destination controller, or the code currently assigned when descent clearance is issued.
      3. The applicable en route code for the holding altitude if holding is necessary before entering the terminal area and the appropriate code in subparas 1 or 2.
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