Chapter 504 D-25 Auxiliary Power Unit
Before the words fell, Fox bounced up from his seat, supported the driver's seat with one hand, and put his body close to the instrument display, Beckman quickly turned sideways to get out of the way, and at the same time pointed to the "223KW" number on the monitor that kept flashing, and the first reaction was whether the instrument display was wrong.
But before he could ask, Hugh Wood, who was in the main pilot's seat, said: "We did another in-depth inspection of the plane this morning, and everything is normal except for the damage to the tail. ”
Before the words fell, Hugh Wood also leaned over, looked at the flickering power, couldn't help frowning, and then turned his head to look at Fox: "Sir, this is the APU provided by Ascendas Aviation Corporation? It seems to be better than we imagined." ”
Hugh Wood meant what he meant, as a pilot, he really wanted to get the DC-10 back in flight, and because of this, he demanded more performance from the APU than anyone else.
Because a powerful and reliable APU is not only the energy source of the supply system of large aircraft ventilation, air conditioning, electricity, pressurization, hydraulics, and engine starting, but also the main source of emergency power for large aircraft in case of emergency.
On more than one occasion, the APU has played a vital role in making the plane land smoothly and setting several miraculous crash landing records.
As a veteran pilot of a large passenger aircraft, Hugh Wood certainly hopes that the APU on the aircraft he flies will be as strong as possible, because this thing can not only improve the environment and service quality of the passenger aircraft, but also save life at critical times.
But what kind of APU is powerful? The most intuitive thing is, of course, that the higher the power, the stronger the performance.
After all, the APU power compartment at the tail is so large, and the APU produced by Honeywell can only provide a maximum of 218 kilowatts of power, and it cannot be maintained for too long, and it can only achieve a continuous power output of 196 kilowatts under normal circumstances.
Although it is enough for DC-10, compared with Boeing's ace Boeing 747, the APU is still much weaker, after all, the APU equipped with Boeing 747 can do the secondary backup of the whole control system, but DC-10 cannot fully connect all backups with APU.
The reason why this is so critical is that the power of the APU is insufficient, resulting in the DC-10 can only connect the backup of the hydraulic system, rudder control system, life support system and other major systems to the APU, and the backup of other systems is connected to the battery carried by the aircraft.
As a result, the design of the DC-10 is not only complicated, once the main engine fails, the aircraft cannot quickly switch the backup control, but needs to adjust several control switches to complete the start of all the backup systems.
This is nothing in normal times, but in a fatal air accident, one-button start and three-button and four-button start are really not a matter of time, but a fatal thing.
Because of this, it is impossible to say that Hugh Wood did not envy the Boeing 747, and McDonnell Douglas also suggested that this aspect needed to be improved in order to reverse the public's perception of McDonnell Douglas as unsafe.
The problem is that McDonnell Douglas has the intention to improve, but APU manufacturers such as Honeywell, General Motors, and Rolls-Royce are sitting on the ground and starting prices, and you McDonnell Douglas wants APUs, no problem, with a premium of 15%.
So before Hugh Wood and others drove this improved DC-10 to China, McDonnell Douglas was still arguing with a supplier of an APU, and no one knew when an agreement would be reached.
Therefore, when Hugh Wood saw the number of the display meter, he was still very happy, because he found that the number of the instrument display could be further mentioned, because the control valve in the hand of Beckman, the co-pilot who controlled the APU, was not pushed to the end, which showed that the APU that had just been replaced still had a lot of power to spare.
The lack of questioning did not make Foss unhappy, because at this moment he also noticed the connection between the valve in Beckman's hand and the power on the instrument display, and immediately asked in surprise: "Haven't you reached the maximum power yet?"
Beckman did not answer, but looked at Hugh Wood on the side with an inquiring gaze, Hugh Wood groaned for a moment, and then nodded: "Push it to the end!"
Hearing this, Beckman pushed the valve down in its entirety, and the number on the instrument display immediately jumped up, and soon it was fixed at 252 kilowatts.
......
"Oh my God, does Hugh Wood want the tail to blow up completely?"
The two McDonnell Douglas technicians who assisted Master Ju and others in completing the installation and retreating to the distance to watch the test situation couldn't help but feel a sudden burst in their hearts when they listened to the constantly harsh APU running sound.
Just now, the old technician, who looked like a farmer in the nearby field, told them that it was not a low-power APU pulled from the Shanghai General Assembly Plant for the MD-82 aircraft, but a D-25 auxiliary power unit produced by the Tengfei Aviation Corporation.
The two McDonnell Douglas technicians who heard this almost didn't scold their mother directly, and were about to turn around and go back to dismantle it, but found that it was too late, and Hugh Wood had already started, so the two quickly picked up the walkie-talkie and prepared to tell Hugh Wood to stop quickly, because no one dared to guarantee that the Chinese product would not explode in the next moment.
But before they could shout, there was a sound of increased power from the tail of the plane, and the two of them were suddenly frightened, and quickly hid back for a long distance, and then stopped, and were about to catch their breath to let Hugh Wood stop, when they saw the old mechanic surnamed Ju smiling disdainfully at them.
This made the two of them both hurt and mad.
"Tell Hugh Wood to stop and settle accounts with the old fellow later, and see if he can laugh a little longer. The fat technician said indignantly.
The technician with toad's eyes hurriedly agreed: "Yes, such a big thing was actually told to us after it was pretended, I don't think they are happy." ”
As he spoke, he picked up the walkie-talkie and was about to press the switch to speak, when he heard the undoubted voice of Fuchs coming from the walkie-talkie: "Is the APU just installed only the starting interface of the engine connected?"
Upon hearing this, the two McDonnell Douglas technicians chuckled in their hearts, and said that there would be no problem found in the cabin, right? The fat technician quickly explained, "Yes, Mr. Fox, but you can listen to my explanation......
"I don't want to listen to your nonsense, now immediately find the technical staff of Tengfei Aviation Corporation, and install all the plane's APU interfaces after the APU is turned off in the cabin!"
As soon as the two of them, who were still thinking about how to phrase it, heard this, their eyes immediately straightened, and they immediately looked at each other, and they both saw a line of words in each other's eyes, whether my ears were broken.
After being stunned for a few seconds, the two of them reacted, and hurriedly grabbed the walkie-talkie to think about the problem and understand what was going on, so they heard the walkie-talkie ring again: "Oh, by the way, the interface of the standby system is also connected, well, that's all, go do it, GO, GO, GO!"
As soon as the two of them heard it, they were GO, GO, GO, what else to say, according to Mr. Fuch's intentions, just at this time, the old technician surnamed Ju once again threw a proud gaze to this side, but this time the two McDonnell Douglas technicians were not angry, and the technician wearing the toad glasses immediately returned with a bright smile, and then waved his hand at Master Ju and shouted eagerly: "Mr. Ju, the test effect just now is good, Mr. Fuchs hopes to make some adjustments, connect all the interfaces of the whole system, and do the whole system test." ”