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AIM

10/12/17

5−4−12

Arrival Procedures

direct to the IAF or to the IF/IAF associated with the

sector that the aircraft will enter the TAA and join the

approach course from that point and if required by

that sector (i.e., sector is not labeled “NoPT),

complete the HILPT course reversal.

NOTE−

If approaching with a TO bearing that is on a sector

boundary, the pilot is expected to proceed in accordance

with a “NoPT” routing unless otherwise instructed by

ATC.

5. Altitudes published within the TAA  replace

the MSA altitude. However, unlike MSA altitudes the

TAA altitudes are operationally usable altitudes.

These altitudes provide at least 1,000 feet of obstacle

clearance, more in mountainous areas. It is important

that the pilot knows which area of the TAA the aircraft

will enter in order to comply with the minimum

altitude requirements. The pilot can determine which

area of the TAA the aircraft will enter by determining

the magnetic bearing of the aircraft TO the fix labeled

IF/IAF. The bearing should then be compared to the

published lateral boundary bearings that define the

TAA areas. Do not use magnetic bearing to the

right-base or left-base IAFs to determine position.

(a) An ATC clearance direct to an IAF or to

the IF/IAF without an approach clearance does not

authorize a pilot to descend to a lower TAA altitude.

If a pilot desires a lower altitude without an approach

clearance, request the lower TAA altitude from ATC.

Pilots not sure of the clearance should confirm their

clearance with ATC or request a specific clearance.

Pilots entering the TAA with two−way radio

communications failure (14 CFR Section 91.185,

IFR Operations: Two−way Radio Communications

Failure), must maintain the highest altitude pre-

scribed by Section 91.185(c)(2) until arriving at the

appropriate IAF.

(b) Once cleared for the approach, pilots may

descend in the TAA sector to the minimum altitude

depicted within the defined area/subdivision, unless

instructed otherwise by air traffic control. Pilots

should plan their descent within the TAA to permit a

normal descent from the IF/IAF to the FAF. In

FIG 5−4−5, pilots within the left or right−base areas

are expected to maintain a minimum altitude of 6,000

feet until within 17 NM of the associated IAF. After

crossing the 17 NM arc, descent is authorized to the

lower charted altitudes. Pilots approaching from the

northwest are expected to maintain a minimum

altitude of 6,000 feet, and when within 22 NM of the

IF/IAF, descend to a minimum altitude of 2,000 feet

MSL until crossing the IF/IAF.

FIG 5−4−5

Sectored TAA Areas

6. U.S. Government charts depict TAAs using

icons located in the plan view outside the depiction of

the actual approach procedure. (See FIG 5−4−6). Use