IVAO-TH internal FIR Rules
1. Minimum Ratings
- CTR: minimum rating S3 – must have passed PC – exam
- APP: minimum rating S2
All controllers will be expected to have charts for the position they
are taking and to be familiar with their area.
The following normal frequencies shall be used:
- VTBB_CTR: 120.50 MHz
- VTBB_N_CTR: 120.50 MHz
- VTBB_S_CTR: 126.60 MHz
- VTBD_APP: 119.10 MHz
- VTBD_TWR: 118.10 MHz
- VTBD_GND: 121.90 MHz
Transmission on the Guard-Frequency 121.50 IS NOT ALLOWED – except in
Instruction of how to set the frequency in PC, can be found the manual
before going on-line Transmitting on 121.50 may mercilessly be killed out
from online session by supervisor after the second warning.
All communication HAS TO BE IN ENGLISH.
That means the controller gives instructions in English and the pilot replies
in English and vice versa. This applies for text and voice.
Exception: Thai language will be accepted for instructions during
training sessions, or when asking for advice.
Advice by voice on the ATC frequency should be kept as short as possible.
If longer discussions are required, please create another RW-channel and
continue communications with ATC by text.
Of course, basically anyone can take any position for which he is qualified
(see “Minimum Ratings above).
It is practical that the first controller with a S3 or higher rating who
comes on-line will take the VTBB_CTR position.
Any other controller would then take a position (like VTBD_APP or VTCC_APP,
VTBD_TWR, etc.) below VTBB_CTR according to her/his qualification.
The _CTR controller will take care of approaches and departures from airports
that do not have _APP.
However, in the past we have found that due to the geographical situation
– Thailand is a large country, especially from N to S – it is very difficult
for the CTR controller to simultaneously take care of Approach- and Departure-traffic
both in the N and in the S of the country. This is also due to a limitation
in the maximum range of PC. If we look at the real world charts we will
find that there are actually 7 sectors for VTBB_CTR, all on different frequencies
(go here to see this).
For times with higher traffic therefore the following rule will apply (until
we find a better solution or until we have more qualified controllers, who
can cover all the _APP positions): If there are more than 2 controllers
on-line who are qualified to work on a _CTR position, they shall split the
airspace into TWO _CTR sectors, North and South.
The split shall be just S of VTBD-Approach airspace.
The callsigns and frequencies will be VTBB_N_CTR (Bangkok North Control)
on frequency 120.50 MHz and VTBB_S_CTR (Bangkok South Control) on frequency
In order to avoid discussions about who will be who, the first controller
shall decide which position he wants to take and the second controller shall
4.1 Areas of responsibility
(VTBB_N_CTR / VTBB_S_CTR):
VTBB__N_CTR (120.50): all airports N of Bangkok, including VTBD, if
there is no VTBD_APP
VTBB_S_CTR (126.60): all airports S of Bangkok
Handover procedure for traffic to VTBD from the S:
VTBB_S_CTR shall hand over to VTBB_N_CTR or VTBD_APP when approaching
FL130 on the descent inbound on the STAR to either PAULA or HELEN.
Handover procedure for traffic from VTBD to the S:
VTBB_N_CTR or VTBD_APP shall hand-over to VTBB_S_CTR when approaching
11000 ft on the SID routes to the S or SE
4.2 Frequency and ATIS – Change:
After both controllers have agreed on their positions they shall:
- notify all traffic on the frequency that they will leave for a moment
- both shortly log out of IVAO and log on again with their new call-signs
and new frequency. Do not forget to change your ATIS !
- the controller for VTBB_N_CTR shall inform traffic belonging to VTBB_S_CTR
to change frequency to 126.60.
4.3 Sector File
No change in sector file is required, both controllers will use the
All this of course, shall not apply when we have the following approach
controllers: - VTBD_APP - VTCT_APP - VTSP_APP
When all of these 3 approach positions are available, there is no real
need to split the _CTR airspace.