Anti Det runs

Ok sorry for what may seem a very pointless question but when people do the “anti det runs” on taxiable or airworthy jets how long do you run the engines for and what checks are made ?

Hi, good question 😉

We with our two Lightnings have always done ‘antidets’ every 4-6 weeks over the last 20 years, they usually comprise of;

The first checks are done prior to running.
1. Tyre pressure checks, inflation if needed (usually)
2. Power supply check (makes sure the Trolley ack is suppling the areo instead of just the aircraft battery)
3. Hyd oil and engine oil checks and top ups plus Avpin tank fill
4. Starter system ‘fail safe’ checks and ‘fixes’ :rolleyes:
5. An intake check (me usually) all the way down to the No1 and No2 engines to check for FOD damage, leaks and loose items
6 Remove all panels for visual checks once running

Once the aircraft is out on the pan the following happens:
1.Disucss the plan of attack :rolleyes:
2. No2 engine started first, watching brake pressure rise to within limits, JPT and RPM watched carefully, oil and Hyd warnings out.
3. Once all is settled and all on the ground are happy, the airbrakes are opened and kept open for visual check then retracted, then the flaps are operated and all flying surfaces operated separatley.
4. The throttle is advanced to 55% and a check on the warning panel is done to make sure the generator is on, then advanced to 65% and the DC power comes on line, again a light on the warning panel will go out.
5. At this point all main intsruments can be switched on and checked, rain dispersal and Stand by geni can be checked
6. Next the throttle is advanced though 80% the stage 14 bypass should close at 89% and this is heard and felt, it gives abit more ‘umph’, JPT and RPM noted
7. Throttle advance futher to ‘Max Cold’ (just before the reheat gate stops), again JPT, RPM and nozzle position is checked.(and fuel)
8. Slowly bring the throttle back and check all warnings, RPM drop and JPT rise, back to ‘slow idle’ at 34%
9. If reheat is to be engaged check all around on the ground and if all is good advance the throttle gently, though the gate, again watching JPT,RPM,nozzle positions (four stages) light up is felt. Hold her there are 5 seconds noted all the above and ease the throttle back to idle.
10. Once all is OK and all are happy the throttle is advanced again (up to 65%) to bring the JPT down then the throttle is brought back to the idle positon and shut down is completed.
11. Some one on the ground times the run down, once all has stopped all switches are made safe.

Then its the No1’s turn 😉

The BF’s (first bit) can take 1- 2 hours, the run can be anything up to 10 minutes, fuel use is always a big consideration for us :rolleyes:

Hope that gives you an idea of what running a Lightning 🙂

Ok sorry for what may seem a very pointless question but when people do the “anti det runs” on taxiable or airworthy jets how long do you run the engines for and what checks are made ?

We ran up Canberra WT333 for the first time this year,last time was the begining of December.
We ran both engines for about 20mins and up to 4K,we checked for hydraulic leaks ,operation of the bomb bay doors, flaps and air brakes.All systems seemed to be a ok.
We do this about every 6 weeks or so depending on crew availability and weather conditions,….and it was mighty cold today!
These kind of runs and checks keep the airframe in good shape ready for some fast taxy runs later on in the year,…..I have heard that sometime in May could be the next Brunty open day?