AIM - RAC 4. 4. 9 - Simultaneous Operations

(b) Simultaneous Operations

Simultaneous operations differ from sequential operations in the application of
ATC procedures. The procedures for simultaneous use of intersecting runways
are applied only between two arrivals or an arrival and a departure. Air traffic
controllers will permit an arriving aircraft to cross the runway threshold or a
departing aircraft to begin its takeoff roll without adhering to the conditions in
RAC 4.4.9(a)(ii)(B) and RAC 4.4.9(a)(iv)(B) provided one of the aircraft has
accepted a clearance to land and hold short of the intersecting runways (Figure
4.4). These operations are known as land and hold short operations (LAHSO).

General

LAHSO may be carried out under the following conditions:

(i) the LDA, measured from the threshold or displaced threshold to 200 ft
short of the nearest edge of the runway being intersected must be
published in the CAP and in the CFS. ATC shall also broadcast LAHSO
advisories, including LDAs, through an ATIS or voice advisory, well in
advance of the final approach descent;

(ii) the weather minima of a 1 000-ft ceiling and visibility of three statute
miles are required. In specific cases, these criteria may be reduced by
the Regional Director, Civil Aviation, but only with a written agreement
between ATC and the operator;

(iii) the reported braking action must be not less than good. The runway
must be bare. (No snow, slush, ice, frost, or standing water is visible
from the tower or reported by a competent person. In order to
accommodate small accumulations of ice or snow at the runway edge
during winter operations, only the centre 100 ft of the runway must be
bare.);

(iv) a tailwind of less than five knots is acceptable for normal LAHSO on
both dry and wet runway operations. The maximum allowable
crosswind component for dry runways is 25 kt and 15 kt for LAHSO.
Controllers will not initiate or approve a request for LAHSO on any
runway when crosswinds on that runway exceed the maximum;

(v) ATC must include specific directions to hold short of an intersecting
runway (e.g., “cleared to land Runway 27, hold short of Runway 36”).
Pilots, in accepting the clearance, must read back “cleared to land
Runway 27, hold short of Runway 36.” Having accepted the hold-short
clearance, pilots are obligated to remain 200 ft short of the closest
edge of the runway being intersected. If, for any reason, a pilot is
unsure of being able to comply with a hold-short clearance, the pilot
must advise ATC immediately of non-acceptance of the clearance; it is
far better to be safe than sorry;

Departing Aircraft

(vi) the lines are the same as taxiway exit and holding markings, as
described in AGA 5.4.4. These lines shall be located on the runway 90º
to the hold-short runway centreline, 200 ft short of the nearest edge of
the runway being intersected. Red and white mandatory instruction
signs, illuminated for night LAHSO, shall be located at either end of the
lines. More details on lines can be found in Aerodrome Standards and
Recommended Practices (TP 312 E); and

(vii) for tactical ATC reasons, controllers may offer or approve a pilot
request for the use of a dry runway for landing with a tailwind not
exceeding ten knots. LAHSO will not be authorized on wet runways if
the tailwinds are five knots or more.

NOTE: LAHSO are not authorized if thunderstorms, turbulence, wind shear or
other conditions exist that would adversely affect the restricted
aircraft’s ability to hold short after landing.