Enroute Delays

CHAPTER TWO

INTERMEDIATE FLIGHT PREPARATION WORKBOOK

COMPARISONS:

Method

Advantage

Disadvantage

Pounds per Minute

(1). Once fuel flow/min is

(1). Requires accurate ETEs;

determined, multiply by time

preflight winds must be

reasonably accurate (+ 10-20

remaining

KTS and 10-20 degrees)

(2). In-flight replanning

(2). Must recompute when

fuel flow changes

(3). Math intensive

Matrix

(1). Uses addition instead of

(1). Requires new matrix if

multiplication

fuel flow changes

(2). Accurate

(2). Also dependent on

accurate ETEs

Gauge

(1). Same as matrix, but

(1). Sometimes difficult to

automatically updates if fuel

measure fractions of a gauge

flow changes

(2). Also dependent on

(2). Fast, tactical

accurate ETEs

Pounds per Nautical Mile

(1). Independent of preflight

(1). Cumbersome numbers to

ETEs

multiply and divide; small

(2). Useful on long, straight-

errors in PPNM figure can

line flights (i.e., cross-country

cause large errors

flights)

(2). Difficult to estimate

(3). In-flight replanning

average GS to IAF

Enroute Delays

The enroute approach on I5204 is mandatory with regard to completing the flight. Expect during

I5203 to do a minimum of 3 different approaches at 3 different fields. The approaches on I5203

will normally be filed approaches, but can be unplanned in-flight route change (such as simulated

divert). If planned, the delay should be included on the DD 175, per FLIP, with 0+20 allotted for

the approach. This will require a little more indepth fuel planning on the Jet Card, and FLIP

study to determine the peculiarities of the field.

When executing enroute delays, the clearance limit will be to the airport identifier of the delay

airfield. Further clearance will be given by Approach Control sometime during or after the

approach. It is important to note civilian and military air fields will often keep you up tower

frequency until clear of the Class D airspace, the switch to departure in these cases will be

directed by Tower. In any case be proactive and request your further clearance from ATC if they

do not give you one.

2-14

T-1A FLIGHT PROFILES