AIM 

4/20/23 

b. 

Depending on weather conditions, traffic volume, and the specific combination of runways being utilized 

for arrival operations, a runway may be used for different types of simultaneous operations, including closely 

spaced dependent or independent approaches. Pilots should ensure that they understand the type of operation that 

is being conducted, and ask ATC for clarification if necessary. 

c. 

Parallel approach operations demand heightened pilot situational awareness. A thorough Approach 

Procedure Chart review should be conducted with, as a minimum, emphasis on the following approach chart 

information: name and number of the approach, localizer frequency, inbound localizer/azimuth course, 

glideslope/glidepath intercept altitude, glideslope crossing altitude at the final approach fix, decision height, 

missed approach instructions, special notes/procedures, and the assigned runway location/proximity to adjacent 

runways. Pilots are informed by ATC or through the ATIS that simultaneous approaches are in use. 

d. 

The close proximity of adjacent aircraft conducting simultaneous independent approaches, especially 

simultaneous close parallel PRM approaches mandates strict pilot compliance with all ATC clearances. ATC 

assigned airspeeds, altitudes, and headings must be complied with in a timely manner. Autopilot coupled 

approaches require pilot knowledge of procedures necessary to comply with ATC instructions. Simultaneous 

independent approaches, particularly simultaneous close parallel PRM approaches necessitate precise approach 

course tracking to minimize final monitor controller intervention, and unwanted No Transgression Zone (NTZ) 

penetration. In the unlikely event of a breakout, ATC will not assign altitudes lower than the minimum vectoring 

altitude. Pilots should notify ATC immediately if there is a degradation of aircraft or navigation systems. 

e. 

Strict radio discipline is mandatory during simultaneous independent and simultaneous close parallel PRM 

approach operations. This includes an alert listening watch and the avoidance of lengthy, unnecessary radio 

transmissions. Attention must be given to proper call sign usage to prevent the inadvertent execution of 

clearances intended for another aircraft. Use of abbreviated call signs must be avoided to preclude confusion of 

aircraft with similar sounding call signs. Pilots must be alert to unusually long periods of silence or any unusual 

background sounds in their radio receiver. A stuck microphone may block the issuance of ATC instructions on 

the tower frequency by the final monitor controller during simultaneous independent and simultaneous close 

parallel PRM approaches. In the case of PRM approaches, the use of a second frequency by the monitor controller 

mitigates the “stuck mike” or other blockage on the tower frequency. 

REFERENCE

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AIM, Chapter 4, Section 2, Radio Communications Phraseology and Techniques, gives additional communications information. 

f. 

Use of Traffic Collision Avoidance Systems (TCAS) provides an additional element of safety to parallel 

approach operations. Pilots should follow recommended TCAS operating procedures presented in approved 

flight manuals, original equipment manufacturer recommendations, professional newsletters, and FAA 

publications. 

Arrival Procedures

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