[Code of Federal Regulations]
[Title 14, Volume 2]
[Revised as of January 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR139.315]

[Page 783]
 
                     TITLE 14--AERONAUTICSAND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION 
                               (CONTINUED)
 
PART 139--CERTIFICATION AND OPERATIONS: LAND AIRPORTS SERVING CERTAIN 
AIR CARRIERS--Table of Contents
 
                          Subpart D--Operations
 
Sec. 139.315  Aircraft rescue and firefighting: Index determination.

    (a) An Index is required by paragraph (c) of this section for each 
certificate holder. The Index is determined by a combination of--
    (1) The length of air carrier aircraft expressed in groups; and
    (2) Average daily departures of air carrier aircraft.
    (b) For the purpose of Index determination, air carrier aircraft 
lengths are grouped as follows:
    (1) Index A includes aircraft less than 90 feet in length.
    (2) Index B includes aircraft at least 90 feet but less than 126 
feet in length.
    (3) Index C includes aircraft at least 126 feet but less than 159 
feet in length.
    (4) Index D includes aircraft at least 159 feet but less than 200 
feet in length.
    (5) Index E includes aircraft at least 200 feet in length.
    (c) Except as provided in Sec. 139.319(c), the Index required by 
Sec. 139.319 is determined as follows:
    (1) If there are five or more average daily departures of air 
carrier aircraft in a single Index group serving that airport, the 
longest Index group with an average of 5 or more daily departures is the 
Index required for the airport.
    (2) If there are less than five average daily departures of air 
carrier aircraft in a single Index group serving that airport, the next 
lower Index from the longest Index group with air carrier aircraft in it 
is the Index required for the airport. The minimum designated Index 
shall be Index A.