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Rod Machado’s Private/Commercial Pilot Handbook
9-28

A

Fig. 40
A transponder having Mode C or S capability is also required
from the surface to 10,000 feet MSL, when operating within
30 nm of certain high-capacity airports having Class B air-
space. This requirement is identified by the presence of a
magenta ring around these airports as shown in Figure 41, C B
position A. Fig. 41

Transponder and Mode C or S Within 30 NM Of port, Figure 41, position A. The ring is slightly off-center
Certain Airports in Appendix 1 of FAR Part 91 from the Class B airspace, because the Class B airspace is
centered at the Humble VOR (Figure 41, position B),
In addition to the requirement for a transponder with
while the ring is centered at the airport (position C).
Mode C or Mode S capability in Class A, B and C airspace,
FAR 91.215 also requires this equipment in other areas. Transponders & Mode C or S Above 10,000’ MSL
Several airports listed in appendix D, section 1 of FAR
A transponder with Mode C is also required in all the
Part 91 require a transponder with Mode C capability
airspace of the 48 contiguous United States and the
from the surface to 10,000’ MSL when operating within 30
District of Columbia when operating at and above 10,000
nautical miles of that airport (Figure 40). You can tell if feet MSL, excluding the airspace at and below 2,500 feet
an airport requires this by looking at the aeronautical sec- AGL (Figure 42). If you’re flying at or below 2,500 feet
tional chart. You’ll see a magenta colored ring surround- AGL above Mt. Whitney (standing at 14,491' MSL), you
ing the primary airport listing this Mode-C requirement, don’t need a transponder with Mode C (although you
as shown at George Bush Intercontinental Houston air- should bring a parka and mittens).

Mode C or S Transponder and Equipment Meeting
The Requirements of ES/ADS-B and TIS-B

Mode C or S Transponder
Class E And ADS-B (OUT) Required In Class E

Yellow, Blue & Magenta Areas

No Transponder/ADS-B (OUT)
Mode C Veil Mode C Veil Required in Hatched Area

Fig. 42