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AIM

10/12/17

4−1−14

Services Available to Pilots

(b) When not assigned an altitude, the pilot

should coordinate with ATC prior to any altitude

change.

8. Within the TRSA, traffic information on

observed but unidentified targets will, to the extent

possible, be provided to all IFR and participating

VFR aircraft. The pilot will be vectored upon request

to avoid the observed traffic, provided the aircraft to

be vectored is within the airspace under the

jurisdiction of the controller.

9. Departing aircraft should inform ATC of their

intended destination and/or route of flight and

proposed cruising altitude.

10. ATC will normally advise participating

VFR aircraft when leaving the geographical limits of

the TRSA. Radar service is not automatically

terminated with this advisory unless specifically

stated by the controller.

c. Class C Service. This service provides, in

addition to basic radar service, approved separation

between IFR and VFR aircraft, and sequencing of

VFR arrivals to the primary airport.

d. Class B Service. This service provides, in

addition to basic radar service, approved separation

of aircraft based on IFR, VFR, and/or weight, and

sequencing of VFR arrivals to the primary airport(s)

.

e. PILOT RESPONSIBILITY. THESE SER-

VICES ARE NOT TO BE INTERPRETED AS

RELIEVING PILOTS OF THEIR RESPONSIBILI-

TIES TO SEE AND AVOID OTHER TRAFFIC

OPERATING IN BASIC VFR WEATHER CONDI-

TIONS, TO ADJUST THEIR OPERATIONS AND

FLIGHT PATH AS NECESSARY TO PRECLUDE

SERIOUS WAKE ENCOUNTERS, TO MAINTAIN

APPROPRIATE TERRAIN AND OBSTRUCTION

CLEARANCE, OR TO REMAIN IN WEATHER

CONDITIONS EQUAL TO OR BETTER THAN

THE MINIMUMS REQUIRED BY 14 CFR

SECTION 91.155. WHENEVER COMPLIANCE

WITH AN ASSIGNED ROUTE, HEADING

AND/OR ALTITUDE IS LIKELY TO COMPRO-

MISE PILOT RESPONSIBILITY RESPECTING

TERRAIN AND OBSTRUCTION CLEARANCE,

VORTEX EXPOSURE, AND WEATHER MINI-

MUMS, APPROACH CONTROL SHOULD BE SO

ADVISED AND A REVISED CLEARANCE OR

INSTRUCTION OBTAINED

.

f. ATC services for VFR aircraft participating in

terminal radar services are dependent on ATC radar.

Services for VFR aircraft are not available during

periods of a radar outage and are limited during

CENRAP operations. The pilot will be advised when

VFR services are limited or not available.

NOTE−

Class B and Class C airspace are areas of regulated

airspace. The absence of ATC radar does not negate the

requirement of an ATC clearance to enter Class B airspace

or two way radio contact with ATC to enter Class C

airspace.

4−1−19. Tower En Route Control (TEC)

a. TEC is an ATC program to provide a service to

aircraft proceeding to and from metropolitan areas. It

links designated Approach Control Areas by a

network of identified routes made up of the existing

airway structure of the National Airspace System.

The FAA initiated an expanded TEC program to

include as many facilities as possible. The program’s

intent is to provide an overflow resource in the low

altitude system which would enhance ATC services.

A few facilities have historically allowed turbojets to

proceed between certain city pairs, such as

Milwaukee and Chicago, via tower en route and these

locations may continue this service. However, the

expanded TEC program will be applied, generally,

for nonturbojet aircraft operating at and below

10,000 feet. The program is entirely within the

approach control airspace of multiple terminal

facilities. Essentially, it is for relatively short flights.

Participating pilots are encouraged to use TEC for

flights of two hours duration or less. If longer flights

are planned, extensive coordination may be required

within the multiple complex which could result in

unanticipated delays.

b. Pilots requesting TEC are subject to the same

delay factor at the destination airport as other aircraft

in the ATC system. In addition, departure and en route

delays may occur depending upon individual facility

workload. When a major metropolitan airport is

incurring significant delays, pilots in the TEC

program may want to consider an alternative airport

experiencing no delay.

c. There are no unique requirements upon pilots to

use the TEC program. Normal flight plan filing

procedures will ensure proper flight plan processing.

Pilots should include the acronym “TEC” in the