HMU Status and Monitoring Process

HMU Status Information

HMU	Operating Status		Remarks
Setouchi HMU (Shodo DME Site) 343044N 1341627E		In Service	[Planned Outage] 14:30 - 16:30 UTC (21-May-2019) 14:00 - 18:00 UTC (2-Jul-2019) During this period, Setouchi HMU will be out of service due to maintenance.
Niigata HMU 375807N 1385205E		In Service	[Planned Outage] 14:30 - 16:30 UTC (21-May-2019) 16:00 - 18:30 UTC (29-May-2019) During this period, Niigata HMU will be out of service due to maintenance.
Sendai HMU 380903N 1403942E		In Service	[Planned Outage] 14:00 - 22:00 UTC (16-May-2019) 14:30 - 16:30 UTC (21-May-2019) 13:00 - 17:00 UTC (13-Jun-2019) During this period, Sendai HMU will be out of service due to maintenance.

Monitoring Process

- flights within the horizontal coverage
- flights between Flight Level 290 and 410 inclusive

Coverage

Name of HMU	Setouchi	Niigata	Sendai
Coverage Chart (Click for large one)
Remarks	Within the radius of 40 NM from the HMU (refer to the above as to the coordinates of the HMU).	Within the radius of 30 NM from the HMU (refer to the above as to the coordinates of the HMU).	Within the radius of 30 NM from the HMU (refer to the above as to the coordinates of the HMU).

Coordination of the flight to receive the height monitoring service

For flight planning to receive the height monitoring service, prior coordination should be made with the Monitoring Flight Desk.

Monitoring Hours

(Usual flight operation)
No special procedure is required by the operator. All the HMUs measure automatically every overflight within its coverage in 24H and 7 days basis except periodic maintenance and unexpected technical problems. Check the HMU Status Information as shown above.

Course and Flight Level

At least 20NM straight and level flight within the coverage is required. Pilots should not solicit a haphazard height monitoring in flight due to an impact on ATC workload. Pre-coordination for a height monitoring should be addressed to the Air Traffic Management Center as shown below.

Result

The summary of the successful measurement results will be shown in the "Reports" page of this web site in about 4 weeks.If the measurement result of a specific aircraft shows deterioration in height keeping performance, the report to ask an improvement of height keeping performance is made to the operator or the other RMA, in accordance with “The operating procedure for the safety assessment of the RVSM airspaces and the height keeping performance monitoring” ( Japanese : ) 4.2. and 5.2.2. established by Japan Civil Aviation Bureau.

Note

By flying over either Setouchi, Niigata or Sendai HMU at RVSM flight level band, the height monitoring is conducted automatically for height keeping accuracy to be measured.

In an adverse weather condition, there may be a case where the measuring accuracy may not be accurate enough hence nullifying the measurement result.

Separation setting has precedence and, if necessary, altitude change and/or changing flight direction may be instructed, thus cancelling the measurement.

For further information

If you have any questions about height monitoring, please contact to the e-mail address or phone number.

<JASMA desk>
Flight Procedures and Airspace Program Office,
Air Navigation Services Department, Civil Aviation Bureau
E-mail: hqt-JASMA@ml.mlit.go.jp
TEL: +81-3-5253-8750
FAX: +81-3-5253- 1664

If you would like to consult about a tailored flight plan for height monitoring, please contact to the e-mail address or phone number below at least five (5) weekdays prior to requesting monitoring date.

<Monitoring flight desk>
Air Traffic Management Center
E-mail: cab-atmchmuroute@ml.mlit.go.jp
TEL: +81-92-608-8869
FAX: +81-92-608-8880

Copyright(C) 2019 Japan Airspace Safety Monitoring Agency. All Rights Reserved.