Commercial Fixed Wing
Dispatch Dispatcher
Communication Breakdown
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Overcame Equipment Problem
Aircraft; Company Policy; Environment - Non Weather Related; Human Factors
Flight planned through HF required airspace on a non-HF equipped aircraft.This flight was rerouted to avoid ZZZ1 [Center] airspace due ATC 0 for COVID cleaning. XA20z - XE01z. I looked at routing through the gulf and over Country Y but no overfly permit available for this flight number. Contacted Airnav / Overfly to confirm no overfly permit. They said we no longer apply for the ZZZ-ZZZ1 or ZZZ-ZZZ2 [airport] flights. So I planned the flight to go east of ZZZ1 [Center]. This route took the flight through ZZZ [Center] Oceanic airspace. I failed to recall that that section of ZZZ [Center] Oceanic airspace is HF comm only; no CPDLC or VHF comm. The aircraft assigned to the flight did not have HF voice. The flight was able to continue by relaying position reports though our Aircraft Y on Guard frequency flying the same route/airspace.With the frequent airspace closures due to COVID cleaning we need more routing options to and from the US - Country Z. We need to start applying for Country Y overfly permits for these southbound flights again so that is an option for us. In addition to usable Country Y routes; a canned route that takes us east of ZZZ1 [Center] and ZZZ2 [Center] needs to be added with route remarks stating that dual HF voice is required for that route. It has been some time since we operated in that portion of ZZZ [Center] airspace and I failed to recall the requirement for HF. I assume the majority of dispatchers would make the same mistake who work this sector less frequently.
Dispatcher reported planning a flight through HF required airspace on a non-HF equipped aircraft.