Hong Kong International Airport is currently being expanded with a third runway, with constructed started in 2016 and being completed in stages.
Airport Authority Hong Kong photo
In 2018 construction of the sea wall around the future northern runway commenced.
And in 2019 the first parcel of reclaimed land was handed over, allowing construction of the new North Runway to commence in 2020.
In December 2021 the existing North Runway was re-designated as the Centre Runway, to avoid conflicts with the new runway.
Airport Authority Hong Kong (AAHK) announced that the existing North Runway (07L/25R) at Hong Kong International Airport (HKIA) has been re-designated as the Centre Runway (07C/25C) today, signifying an important milestone for the expansion of the airport into a Three-runway System (3RS).
The new Third Runway, which will be put into operation in 2022, will be designated as the North Runway (07L/25R). Prior to that, the existing North Runway has to be re-designated as the Centre Runway (07C/25C) according to International Civil Aviation Organisation’s requirement.
At 0001hrs on 2 December, the North Runway of HKIA was closed to undergo the final re-designation procedures. The runway designation markings and the mandatory instruction markings of 07L and 25R on the runway and taxiways respectively were replaced by 07C and 25C.
Movement area guidance signs on the airfield, as well as relevant equipment and procedures for HKIA’s air traffic control and airport operations control systems were also modified. The South Runway remained in operation when the North Runway was being re-designated and air traffic movements at the HKIA operated smoothly throughout the period.
Existing runway signs had to be swapped out.
Airport Authority Hong Kong photo
Along with the identifiers painted on taxiways.
Airport Authority Hong Kong photo
And on the runway itself.
Airport Authority Hong Kong photo
In March 2022 a number of aircraft stands were also redesignated.
Airport Authority Hong Kong photo
To avoid conflicts with future taxiways.
Aircraft parking stand numbers at HKIA bear prefixes that indicate their location at the airport. The prefixes “C” and “E”, which were respectively used for cargo aircraft stands at the cargo apron and passenger stands at the east side of Terminal 1, will be employed as taxiway designators for the new taxiway system of 3RS, hence the re-designation of parking stands bearing the “C” and “E” prefixes.
The parking stands for passenger aircraft were closed overnight and those for cargo aircraft in phases, while ensuring normal aircraft operations during re-designation works. A total of 36 cargo aircraft stands were given the new prefix “X”, while nine passenger aircraft stands have adopted the prefix “N” or “S”, which follows their adjacent stands at Terminal 1. Relevant signage such as Movement Area Guidance Signs and Stand Number Indicators, as well as relevant systems, were also updated.
Operational familiarisation for flights on the new third runway commenced in July 2022.
Airport Authority Hong Kong photo
And on 25 November 2022 the third runway was officially commissioned.
Airport Authority Hong Kong photo
The airport configured as the Interim Two-Runway System (I-2RS) using the new North Runway and existing South Runway – the centre runway temporarily closed to be reconfigured for the new three runway layout. These works include levelling the runway pavement to tie in with connecting taxiways, constructing new runway entry and exit taxiways, and building new wrap-around taxiways at both ends of the runway.
Airport Authority Hong Kong photo
These works were completed ready for the first flight checks in August 2024, with the final three runway system opened to flights from 28 November 2024.
Airport Authority Hong Kong photo
Footnote: runway numbering
So what does 07L, 25R, 07C and 25C mean? 99% Invisible has the rundown on How to Decipher Two-Digit Airport Runway Designations, with Pilot Institute covering them in extra detail.