320如果要封飞机，关APU大概要等多长时间？

里昂

空调系统工作，如果要封飞机，关APU大概要等多长时间？如果空调系统不工作，又要等多长时间？手册哪里有标准？

kli_08

这个是APU型号的。
131-9A
When the MASTER SW is OFF, the ECB closes the IGVs to the minimum
position of 15°, the load control valve closes if it is open, the surge control
valve opens and the cool-down cycle of the APU starts.
The cool-down cycle lets the APU operate for 60 seconds at a low
stabilized temperature. It starts when the ECB receives the closed signal
from the load control valve. If the load control valve was not in the open
position, the APU shuts down immediately.
During every normal shutdown the ECB tests its overspeed protection
circuit by simulating an overspeed condition, which causes the 3-way
shut-off solenoid in the Fuel Control Unit to close, and thereby starts the
APU roll-down.
It is possible to command an APU re-start during the shutdown sequence.
APU speed must be below 7% before the starter motor is re-engaged.

APS3200
COOLDOWN STATE
At stop command MASTER SW OFF, the pneumatic load is removed,
i.e. the IGVs are closed, the bleed control valve positioned to discharge,
the AC generator may still be loaded, then the engine goes into a 120 s
cool down cycles. This function runs the APU at a low stabilized
temperature before normal shutdown.
NORMAL SHUTDOWN
An APU normal shutdown is initiated when the MASTER SW P/B is
released out. If the APU bleed air is not selected, the APU shuts down
immediately. The normal shutdown signal stops the fuel supply. This
causes the APU to decelerate. The AVAIL indication goes off and the
AC generator de-energizes. When the speed is less than 90% rpm, the
gearbox de-oil solenoid valve opens. When the speed is less than 7%
rpm, the air intake flap is controlled to fully close and the de-oiling
solenoid valve is de-energized to close.

lavendish

请参考AMM TASK 49-00-00-860-009-A01和TASK 49-00-00-860-009-A，正常情况下是两分钟左右。但还是以FLAP何时关闭来决定。

下附有关COOLDOWN STATE 和NORMAL SHUTDOWN 的介绍
COOLDOWN STATE
At stop command MASTER SW OFF, the pneumatic load is removed,
i.e. the IGVs are closed, the bleed control valve positioned to discharge,
the AC generator may still be loaded, then the engine goes into a 120 s
cool down cycles. This function runs the APU at a low stabilized
temperature before normal shutdown.
NORMAL SHUTDOWN
An APU normal shutdown is initiated when the MASTER SW P/B is
released out. If the APU bleed air is not selected, the APU shuts down
immediately. The normal shutdown signal stops the fuel supply. This
causes the APU to decelerate. The AVAIL indication goes off and the
AC generator de-energizes. When the speed is less than 90% rpm, the
gearbox de-oil solenoid valve opens. When the speed is less than 7%
rpm, the air intake flap is controlled to fully close.

lavendish

对于空调系统来说，最重要的一点是在关APU之前把BLEED OFF 掉，如果BLEED ON 的情况下关APU 可能要关很久。

你我他

标准的APU断电程序，断电前要确认APU BLEED电门在OFF位，假如刚把APU引气关掉，立马把APU主电门松出断电的话，APU并不会立即断电，而是延时约120秒完成冷却循环之后才断电。如果断电前APU引气已经关了超过120秒，即你说的空调不工作的情况下，只要按出APU主电门，飞机马上就断电了，手册要求等待约2分钟，APU进气门完全关闭后，才能把电瓶断电。
APU的启动和关断在AMM49-00-00-860 ，你可以去仔细看看。

大川航

一楼解释很清楚了

474172560@qq.co

3分钟左右吧

novo_ru

没有使用引气可以直接进入120秒的冷却循环，使用了引气会先把引气用完

星星@点灯

将APU BLEED 关断等待约2分钟，APU进气门完全关闭后，电瓶才断电。

一直飞11

没有开引气的情况下关APU时，大约等1分30秒左右后APU的主电门会闪亮一下，这个闪亮后好像就可以关电瓶了。航后可以看一下。

linxiaoxiao

请参考AMM TASK 49-00-00-860-009-A01和TASK 49-00-00-860-009-A，正常情况下是两分钟左右。但还是以FLAP何时关闭来决定。

下附有关COOLDOWN STATE 和NORMAL SHUTDOWN 的介绍
COOLDOWN STATE
At stop command MASTER SW OFF, the pneumatic load is removed,
i.e. the IGVs are closed, the bleed control valve positioned to discharge,
the AC generator may still be loaded, then the engine goes into a 120 s
cool down cycles. This function runs the APU at a low stabilized
temperature before normal shutdown.
NORMAL SHUTDOWN
An APU normal shutdown is initiated when the MASTER SW P/B is
released out. If the APU bleed air is not selected, the APU shuts down
immediately. The normal shutdown signal stops the fuel supply. This
causes the APU to decelerate. The AVAIL indication goes off and the
AC generator de-energizes. When the speed is less than 90% rpm, the
gearbox de-oil solenoid valve opens. When the speed is less than 7%
rpm, the air intake flap is controlled to fully close.

sanxin

机务英语一直都是硬伤

lg_zhou

学习了