With a fleet of 7 aircraft a couple going unserviceable when others are in the shop is always difficult to overcome. It would be intersting to see the servicabilty of the J fleet in the lastest ops and see if similer things have happened to the RAAF but had the luxury of transferring to other aircraft, I have said it before numbers are a capabilty all on their own.
Have you seen the figures Airbus are quoting for periods between scheduled maintain on the A400? Pretty impressive, if they can deliver against the promise.
The age and a small size of the current fleet really mean the RNZAF is getting hit from 3 different directions on availability:
a) Scheduled maintenance free intervals are decreasing
b) Maintenance periods for scheduled work are increasing
c) Unscheduled maintenance events getting increasingly common
The Crown output agreements generally work around predicted availability. For example, only one Boeing is required to be available, at 12 hours notice. Unscheduled events may reduce this to no aircraft being available (as we saw last week).
The Herc fleet is required to have two aircraft available for operations at all times. The first aircraft is immediately available, the second is at 12 hours notice. The first aircraft is also required to be the backup SAR aircraft if the on-line P-3 goes unavailable, or after the on-line P-3 has sortied and needs post-flight maintenance before a second P-3 is made available to use.
The 'snowball effect' magnifies any events that would normally be trivial in larger air forces.
Scenario for illustration:
1. P-3 launches in response to a SAR operation. Its mission time is around 10 hours.
2. After locating a life raft and using its on station time, the P-3 returns to base and is replaced by the on-line Herc (remembering the second P-3 is at 12 hours notice).
3. The on-line Herc takes over the SAR duties. There are now theoretically no hercs available for 12 hours (unless a warning order has been made prior with enough time to react).
4. If either the Herc or the Orion has an unscheduled defect, the aircraft needs unscheduled maintenance. The time to remedy the defect may well be in excess of the availability time of the next online aircraft. 'Availability gap' is the result.