Paddy's memoires
This is somewhat out of sequence but I thought you might like something with a bit more meat in it. This was almost my last flight in the RAf.
The night London Airport was mine
I was coming to the end of my 3 year tour with the Blind Landing Experimental Unit (BLEU) at RAE Bedford, where I had been posted to carry out the automatic landing trials on the Vulcan. These trials had been initiated after it was realised that in the event of a nuclear attack upon the British Isles, there would be a need to disperse the Vulcan (V.Force) to designated airfields around the country. Since this would have to be carried out regardless of the prevailing weather conditions there was clearly a requirement for an ‘All weather landing system ‘. Automatic landing was the obvious choice.
The main test aircraft at BLEU were Varsity’s. These sturdy twin engine aircraft were used in all manner of tests apart from Automatic Landing. They were pleasant to fly and could carry an immense amount of test equipment and ‘Boffins ‘. In addition to the Varsity, Auto Land was installed very successfully in, Vulcan, Comet 4, Canberra and the American Airliner the DC 7. When flying the latter we always had the aircraft’s American captain on board and oddly enough we had to obtain a Private Pilots Licence, validated for that aircraft.
We flew in all weather conditions as a matter of course, and indeed, sought out airfields we knew were closed due to bad weather to assess the available approach lighting facilities. Occasionally Mr Calvert the grand master of Visual Aid Studies flew with us and it was he who declared. The Varsity was the perfect vehicle in which to carry out these tests in relative safety. Many of these airfields were American and I often wondered what their aircrews thought when they heard a solitary aircraft doing circuits and bumps in thick fog when they could hardly see to drive their cars.
The validity of these tests is self evident. There can be few pilots who enjoy the prospect of a long instrument approach, the transition from instruments to visual, through an uncertain cloud base and variable ground conditions such as, rain, snow, mist or fog. The inputs imposed upon a pilot at the latter stages of an instrument approach are enormous. I recall a senior line pilot saying during a lecture on this subject.....”At 100Ft when you have yet to see the runway, following an instrument descent, you reach the threshold of PAIN.” He was so right.
All our automatic landing tests were carried out using a single channel system. That is to say one of each piece of equipment, Autopilot, Radio Altimeter, ILS (Instrument Landing System) receiver.etc.The proposed civilian versions (Trident) would have three of everything as a safety, belt and braces measure. The whole process, apart from some switch pulling, was automatically controlled....Height and heading....ILS and glide path acquisition ...And one of my favourite items ‘Automatic throttle control...‘ Dial your speed’...What more could one ask for. It meant that the pilot could literally sit ‘ Hands off ‘with confidence until the point of touchdown. In the event of any crosswind, the drift angle was automatically kicked off just before this point. Naturally in fog one does not anticipate strong wind.
We had a long standing contingency plan that if London Airport was ever closed because of fog we would go in and carry out circuits and landings to demonstrate the system. On the 4th December 1962 my colleague ‘Pinky Stark’ went there to do just that but unfortunately his aircraft lacked a vital piece of test equipment which was to have given him directional guidance after the automatic pilot had been disengaged on landing. He was thus restricted to do touch and go landings. Had the fog been less dense and he could have seen at least two centre line lights he would of course have carried out full stop landings.
On the 5th December 1962. Having flown the Comet in the morning I was told to be ready to take a Varsity to London Airport that night to complete the demonstrations. On this occasion I would have the aircraft equipped with the new ‘Runway Guidance Indicator’. This was in ‘Breadboard state ‘. Not yet built into the instrument panel. It consisted of a tube passing over my right shoulder, projecting a Sperry Zero Reader ILS signal onto a ‘Head Up Display’, on a glass prism, mounted on the instrument panel coaming. This piece of equipment was essential in the exceptional conditions which prevailed. The actual ( RVR ) Runway Visual Range on this night was 45 Feet. To put that into perspective, runway centre line lights are spaced at 100Feet, thus only one centre line light could be seen at any one time. Another interesting observation would be...That an observer standing at the edge of the runway, would be unable to see a fully lit Vulcan, stationary on the centre line! I had never before experienced fog as dense as this. The London Airport runway is 300ft wide and the Vulcan a 110ft wingspan.
We took off from Bedford at dusk and carried out two circuits and full stop landings to test the new ‘Runway Guidance’ equipment. It was working efficiently so we left Bedford and was soon circuiting London Airport. The conditions were most unusual; above 300 feet the sky was clear but in the London basin lay this dense ‘ Pea soup’. There were no signs of lights beneath.... London was at a standstill... No buses, no trains... We were to learn that none of the VIP’s scheduled to join us for the demonstration could get to the airport.
However, we were there and plunging into the ‘soup’ on ‘Auto’s using the standard ILS, for azimuth and glide path indication... Soon after we entered the fog we heard the clatter of ice being thrown off the prop’s onto the fuselage....De-icers on...We were already ‘locked’ on the glide path and quite soon the Inner marker beeped, there was no sign of approach lights although we knew they were on....Touch-down still no lights, but we were on the centre line as I could feel from the centre line light pods touching our nose wheel.....Throttles and Auto-land were switched off and I kept straight manually using our new toy...runway guidance.....very gingerly on the brakes lest they cause a swing and so to a full stop. Now, not being able to see any lights at all, how was I going to turn around and return to the take off point? LAP Airfield Radar came to our aid and was able to navigate us through 180 degrees and direct us back to the take off position for a further circuit.
We were supposed to gather up a number of VIP’s at this point but as I have said the fog was such that they were unable to get to LAP. We did however manage to pick up Captain Poole the BEA training pilot. He was brought out in a van navigated by the splendid Ground Radar...I’m sure they could see a Ferret cross the runway.
We carried out four circuits and landings and returned to Bedford....I have often wondered what the authorities would have said had they known that my Instrument Rating had expired some days before!!!!!
Flt.Lt.C. Grogan AFC